[kotlin-client][kotlin-server] Feature/kotlin data class serial version uid (#4021)

* feat: add companion object to data classes if the implement the interface java.io.Serializable

* style: format template file

* style: adapt to project's original code style

* fix: add missing imports

* style: reverted mustache template to original styling

* test: generate additional samples for kotlin-springboot-reactive and kotlin-springboot

* docs: name full qualified classname of interface java.io.Serializable to prevent confusion with kotlinx.serialization

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/models/ApiResponse.kt

@@ -29,3 +29,5 @@ data class ApiResponse (
 
 
 
+
+

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/models/Category.kt

@@ -27,3 +27,5 @@ data class Category (
 
 
 
+
+

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/models/Order.kt

@@ -35,7 +35,8 @@ data class Order (
 ) 
 
 
-{
+
+
 
     /**
     * Order Status
@@ -54,5 +55,5 @@ data class Order (
         object Serializer : CommonEnumSerializer<Status>("Status", values(), values().map { it.value }.toTypedArray())
     }
 
-}
+
 

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/models/Pet.kt

@@ -37,7 +37,8 @@ data class Pet (
 ) 
 
 
-{
+
+
 
     /**
     * pet status in the store
@@ -56,5 +57,5 @@ data class Pet (
         object Serializer : CommonEnumSerializer<Status>("Status", values(), values().map { it.value }.toTypedArray())
     }
 
-}
+
 

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/models/Tag.kt

@@ -27,3 +27,5 @@ data class Tag (
 
 
 
+
+

samples/client/petstore/kotlin-multiplatform/src/commonMain/kotlin/org/openapitools/client/models/User.kt

@@ -40,3 +40,5 @@ data class User (
 
 
 
+
+