[BUG] Kotlin-retrofit2-gson-coroutines CollectionsFormat.CSVParams default value is set to arrayListOf()

[fvlahov]

Bug Report Checklist

• [x] Have you provided a full/minimal spec to reproduce the issue?
• [x] Have you validated the input using an OpenAPI validator (example)?
• [x] Have you tested with the latest master to confirm the issue still exists?
• [x] Have you searched for related issues/PRs?
• [x] What's the actual output vs expected output?
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Description

Open api generator where the code generated gives parameter of type CSVParams gives wrong default implementation, it should create the CSVParams class but instead it is @Query("sort") sort: CSVParams? = arrayListOf("date:desc")

openapi-generator version

7.6.0

OpenAPI declaration file content or url

    SortSchema:
      type: array
      description: |
        ...
      default: [ 'date:desc' ]
      items:
        type: string
        pattern: '^(date|name|popularity|trend)(:(asc|desc))?$'
      example: [ 'date:desc', 'name' ]

Generation Details

        generatorName = "kotlin"
        inputSpec = "$rootDir/data/src/main/assets/openapi/${spec.value}"
        outputDir = "$buildDir/generated/openapi"
        configOptions = [
                dateLibrary         : "java17",
                library             : "jvm-retrofit2",
                serializationLibrary: "gson",
                useCoroutines       : "true"
        ]
        nameMappings = [
                "identifier": "id"
        ]
        modelNamePrefix = "Api"
        apiNameSuffix = "Api"
        generateModelTests = false
        generateApiTests = false

Steps to reproduce

• Generate retrofit API and classes with openApiGenerate {}
• Build fails due to compilation error

Related issues/PRs

Suggest a fix

Default value of CSVParams should create an instance of CSVParams class instead of ArrayList