fix: register gson CustomTypeAdapterFactory in kotlin-client if generateOneOfAnyOfWrappers enabled (#20217)

Author: Djaler

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/Serializer.kt.mustache

@@ -97,6 +97,17 @@ import java.util.concurrent.atomic.AtomicLong
         .registerTypeAdapter(LocalDateTime::class.java, LocalDateTimeAdapter())
         .registerTypeAdapter(LocalDate::class.java, LocalDateAdapter())
         .registerTypeAdapter(ByteArray::class.java, ByteArrayAdapter())
+        {{#generateOneOfAnyOfWrappers}}
+        {{#models}}
+        {{#model}}
+        {{^isEnum}}
+        {{^hasChildren}}
+        .registerTypeAdapterFactory({{modelPackage}}.{{{classname}}}.CustomTypeAdapterFactory())
+        {{/hasChildren}}
+        {{/isEnum}}
+        {{/model}}
+        {{/models}}
+        {{/generateOneOfAnyOfWrappers}}
 
     @JvmStatic
     val gson: Gson by lazy {

samples/client/petstore/kotlin-model-prefix-type-mappings/src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt

@@ -14,6 +14,17 @@ object Serializer {
         .registerTypeAdapter(LocalDateTime::class.java, LocalDateTimeAdapter())
         .registerTypeAdapter(LocalDate::class.java, LocalDateAdapter())
         .registerTypeAdapter(ByteArray::class.java, ByteArrayAdapter())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiAnnotation.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiAnyOfUserOrPet.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiAnyOfUserOrPetOrArrayString.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiApiResponse.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiCategory.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiOrder.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiPet.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiTag.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiUser.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiUserOrPet.CustomTypeAdapterFactory())
+        .registerTypeAdapterFactory(org.openapitools.client.models.ApiUserOrPetOrArrayString.CustomTypeAdapterFactory())
 
     @JvmStatic
     val gson: Gson by lazy {