Added Kotlin Vert.x client (#13594)

* Initial version of Kotlin Vert.x client

* Initial version of Kotlin Vert.x client

* Initial version of Kotlin Vert.x client

* Fix for parseDateToQueryString issue in vert.x kotlin client

* Moved common methods from api to ApiClient in kotlin vert.x client

* Fixed issue with absolute URLs

* bearer auth for oauth

* empty request headers fix

* missing import and typo

* added uri template dependency

* added api abstractions to client generator

* added full import form infrastructure

* removed fail on unknown properties to response body parsing

* fixed error response parsing

* replace vertx client name to more unique

* multiline content type

* optional responses added to template

* additional annotations for kotlin client

* Added additionalModelTypeAnnotations parameter support to AbstractKotlinCodegen

* Updated samples and documents

* Fixed issues with gson and moshi serializers with kotlin-jvm-vertx client

* Added sample configs for kotlin-jvm-vertx clients with gson, jackson and moshi

* Added samples for kotlin-jvm-vertx clients with gson, jackson and moshi

* Included kotlin-jvm-vertx samples to test build

* Updated samples

Co-authored-by: Katja Danilova <katja.danilova@protonmail.com>

samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/models/Category.kt

@@ -26,6 +26,7 @@ import java.io.Serializable
  * @param name 
  */
 
+
 data class Category (
 
     @Json(name = "id")

samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/models/ModelApiResponse.kt

@@ -27,6 +27,7 @@ import java.io.Serializable
  * @param message 
  */
 
+
 data class ModelApiResponse (
 
     @Json(name = "code")

samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/models/Order.kt

@@ -30,6 +30,7 @@ import java.io.Serializable
  * @param complete 
  */
 
+
 data class Order (
 
     @Json(name = "id")

samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/models/Pet.kt

@@ -32,6 +32,7 @@ import java.io.Serializable
  * @param status pet status in the store
  */
 
+
 data class Pet (
 
     @Json(name = "name")

samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/models/Tag.kt

@@ -26,6 +26,7 @@ import java.io.Serializable
  * @param name 
  */
 
+
 data class Tag (
 
     @Json(name = "id")

samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/models/User.kt

@@ -32,6 +32,7 @@ import java.io.Serializable
  * @param userStatus User Status
  */
 
+
 data class User (
 
     @Json(name = "id")