[BUG][Kotlin][Multiplatform] Incorrect api code when collectionType is list

Description

Kotlin multiplatform client generator is generating incorrect code when collectionType is list. It is generating code that is only appropriate for collectionType of array

openapi-generator version

4.2.3

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  description: Blah
  version: v2
paths:
  /api/v2/query:
    post:
      operationId: foo
      requestBody:
        content:
          application/json:
            schema:
              type: array
              items:
                type: string
      responses:
        '200':
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string

Command line used for generation

openapi-generator generate -i test.yml -g kotlin --skip-validate-spec -pcollectionType=list -o output --library multiplatform

Steps to reproduce

• Store the yml contents into a file named test.yml.
• execute above command line
• examine the contents of output/src/commonMain/kotlin/org/openapitools/client/apis/DefaultApi.kt

You will see this generated code that will not compile:

    suspend fun foo(requestBody: kotlin.collections.List<kotlin.String>?) : HttpResponse<kotlin.collections.List<kotlin.String>> {
        val localVariableAuthNames = listOf<String>()

        val localVariableBody = FooRequest(requestBody.asList())

/*-- irrelevant intervening code removed --*/

        return jsonRequest(
            localVariableConfig,
            localVariableBody,
            localVariableAuthNames
        ).wrap<FooResponse>().map { value.toTypedArray() }
    }

The problem here is that the .asList() and .toTypedArray() calls should not be there because requestBody is a list already and the return type is a list not an array.

When collectionType is array those calls are needed because the signature in that case is

    suspend fun foo(requestBody: kotlin.Array<kotlin.String>?) : HttpResponse<kotlin.Array<kotlin.String>> {

Suggest a fix

The template needs to check the collectionType and generate the code appropriately.

Reproduce the command using test.yml and inspect output/src/commonMain/kotlin/org/openapitools/client/apis/DefaultApi.kt. Start with the Kotlin multiplatform generator templates that produce the request and response conversions, compare the list and array cases, and verify that generated list code no longer uses asList() or toTypedArray() and compiles.