[Kotlin][Client] Fix url path for Retrofit, Fix optionals for @Query @Body, Set List as default collection for Kotlin data class (#6456)

* Replace typeMapping kotlin.Array with kotlin.collections.List, because its doesn't work with Kotlin Data Classes(required manually implementing  hashCode&equals)
Replace typeMapping kotlin.Array<kotlin.Byte> with efficient primitive implementation kotlin.ByteArray
Replace instantiationTypes array to kotlin.collections.ArrayList, for extending Array we should provide element count to its constructor.

* Fixed path(removed slash on begin path) for Jvm Kotlin Retrofit

* Fixed handling optional bodyParams for Jvm Kotlin Retrofit

* Fix kotlin tests

* Fixed code format for detekt inspections #2

* revert formatting

* Added ability to generate optional @Query params.

* Update Kotlin docs.

* Update Kotlin openapi3 client samples

* Update Kotlin client samples

* Update Kotlin openapi3 client samples after merge with master

* Revert hardcoding List instead Array

* Set List as default collectionType

* Update Kotlin samples

* Fixed Kotlin multiplatform api template. fix mapper for Array type.
Fixed Kotlin multiplatform api template Code style.

* Update Kotlin multiplatform sample

* Fix Kotlin multiplatform template code style

* Update Kotlin multiplatform sample

* Fix Kotlin multiplatform converting Array to List in Api.

* Update Kotlin multiplatform sample #3

* Fix Kotlin tests

* Fix Kotlin jackson Application.kt

* Fix Kotlin tests #2

* Fix merge conflict with master

* Generate samples after merge with master

* Generate samples after merge with master #2

* Generate samples after merge with master #3

* Generate samples after merge with master #4

* update kotlin samples

* update all samples

Co-authored-by: William Cheng <wing328hk@gmail.com>

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt

@@ -119,7 +119,7 @@ class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
     * Finds Pets by tags
     * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
     * @param tags Tags to filter by 
-    * @return kotlin.Array<Pet>
+    * @return kotlin.collections.List<Pet>
     * @throws UnsupportedOperationException If the API returns an informational or redirection response
     * @throws ClientException If the API returns a client error response
     * @throws ServerException If the API returns a server error response
@@ -127,7 +127,7 @@ class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
     @Suppress("UNCHECKED_CAST")
     @Throws(UnsupportedOperationException::class, ClientException::class, ServerException::class)
     @Deprecated(message = "This operation is deprecated.")
-    fun findPetsByTags(tags: kotlin.Array<kotlin.String>) : kotlin.Array<Pet> {
+    fun findPetsByTags(tags: kotlin.collections.List<kotlin.String>) : kotlin.collections.List<Pet> {
         val localVariableBody: kotlin.Any? = null
         val localVariableQuery: MultiValueMap = mutableMapOf<kotlin.String, List<kotlin.String>>()
             .apply {
@@ -140,13 +140,13 @@ class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
             query = localVariableQuery,
             headers = localVariableHeaders
         )
-        val localVarResponse = request<kotlin.Array<Pet>>(
+        val localVarResponse = request<kotlin.collections.List<Pet>>(
             localVariableConfig,
             localVariableBody
         )
 
         return when (localVarResponse.responseType) {
-            ResponseType.Success -> (localVarResponse as Success<*>).data as kotlin.Array<Pet>
+            ResponseType.Success -> (localVarResponse as Success<*>).data as kotlin.collections.List<Pet>
             ResponseType.Informational -> throw UnsupportedOperationException("Client does not support Informational responses.")
             ResponseType.Redirection -> throw UnsupportedOperationException("Client does not support Redirection responses.")
             ResponseType.ClientError -> {
@@ -164,14 +164,14 @@ class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
     * Get all pets
     * 
     * @param lastUpdated When this endpoint was hit last to help indentify if the client already has the latest copy. (optional)
-    * @return kotlin.Array<Pet>
+    * @return kotlin.collections.List<Pet>
     * @throws UnsupportedOperationException If the API returns an informational or redirection response
     * @throws ClientException If the API returns a client error response
     * @throws ServerException If the API returns a server error response
     */
     @Suppress("UNCHECKED_CAST")
     @Throws(UnsupportedOperationException::class, ClientException::class, ServerException::class)
-    fun getAllPets(lastUpdated: java.time.OffsetDateTime?) : kotlin.Array<Pet> {
+    fun getAllPets(lastUpdated: java.time.OffsetDateTime?) : kotlin.collections.List<Pet> {
         val localVariableBody: kotlin.Any? = null
         val localVariableQuery: MultiValueMap = mutableMapOf<kotlin.String, List<kotlin.String>>()
             .apply {
@@ -186,13 +186,13 @@ class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
             query = localVariableQuery,
             headers = localVariableHeaders
         )
-        val localVarResponse = request<kotlin.Array<Pet>>(
+        val localVarResponse = request<kotlin.collections.List<Pet>>(
             localVariableConfig,
             localVariableBody
         )
 
         return when (localVarResponse.responseType) {
-            ResponseType.Success -> (localVarResponse as Success<*>).data as kotlin.Array<Pet>
+            ResponseType.Success -> (localVarResponse as Success<*>).data as kotlin.collections.List<Pet>
             ResponseType.Informational -> throw UnsupportedOperationException("Client does not support Informational responses.")
             ResponseType.Redirection -> throw UnsupportedOperationException("Client does not support Redirection responses.")
             ResponseType.ClientError -> {

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt

@@ -83,7 +83,7 @@ class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
     * @throws ServerException If the API returns a server error response
     */
     @Throws(UnsupportedOperationException::class, ClientException::class, ServerException::class)
-    fun createUsersWithArrayInput(body: kotlin.Array<User>) : Unit {
+    fun createUsersWithArrayInput(body: kotlin.collections.List<User>) : Unit {
         val localVariableBody: kotlin.Any? = body
         val localVariableQuery: MultiValueMap = mutableMapOf()
         val localVariableHeaders: MutableMap<String, String> = mutableMapOf()
@@ -123,7 +123,7 @@ class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
     * @throws ServerException If the API returns a server error response
     */
     @Throws(UnsupportedOperationException::class, ClientException::class, ServerException::class)
-    fun createUsersWithListInput(body: kotlin.Array<User>) : Unit {
+    fun createUsersWithListInput(body: kotlin.collections.List<User>) : Unit {
         val localVariableBody: kotlin.Any? = body
         val localVariableQuery: MultiValueMap = mutableMapOf()
         val localVariableHeaders: MutableMap<String, String> = mutableMapOf()

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/models/ApiResponse.kt

@@ -13,6 +13,7 @@ package org.openapitools.client.models
 
 
 import com.squareup.moshi.Json
+
 /**
  * Describes the result of uploading an image resource
  * @param code 

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/models/Category.kt

@@ -13,6 +13,7 @@ package org.openapitools.client.models
 
 
 import com.squareup.moshi.Json
+
 /**
  * A category for a pet
  * @param id 

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/models/Order.kt

@@ -13,6 +13,7 @@ package org.openapitools.client.models
 
 
 import com.squareup.moshi.Json
+
 /**
  * An order for a pets from the pet store
  * @param id 

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/models/Pet.kt

@@ -15,6 +15,7 @@ import org.openapitools.client.models.Category
 import org.openapitools.client.models.Tag
 
 import com.squareup.moshi.Json
+
 /**
  * A pet for sale in the pet store
  * @param name 
@@ -29,13 +30,13 @@ data class Pet (
     @Json(name = "name")
     val name: kotlin.String,
     @Json(name = "photoUrls")
-    val photoUrls: kotlin.Array<kotlin.String>,
+    val photoUrls: kotlin.collections.List<kotlin.String>,
     @Json(name = "id")
     val id: kotlin.Long? = null,
     @Json(name = "category")
     val category: Category? = null,
     @Json(name = "tags")
-    val tags: kotlin.Array<Tag>? = null,
+    val tags: kotlin.collections.List<Tag>? = null,
     /* pet status in the store */
     @Json(name = "status")
     val status: Pet.Status? = null

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/models/Tag.kt

@@ -13,6 +13,7 @@ package org.openapitools.client.models
 
 
 import com.squareup.moshi.Json
+
 /**
  * A tag for a pet
  * @param id 

samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/models/User.kt

@@ -13,6 +13,7 @@ package org.openapitools.client.models
 
 
 import com.squareup.moshi.Json
+
 /**
  * A User who is purchasing from the pet store
  * @param id