[BUG][Kotlin][Multiplatform] byte[] is represented as List<Base64ByteArray> instead of Base64ByteArray

Bug Report Checklist

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

Description

I have a field in my Java DTO that is of type byte[]. Swagger spec generated for it looks like this:

          "responseBody": {
            "type": "array",
            "items": {
              "type": "string",
              "format": "byte"
            }
          }

openapi-generator version

6.0.1-SNAPSHOT

OpenAPI declaration file content or url

          "responseBody": {
            "type": "array",
            "items": {
              "type": "string",
              "format": "byte"
            }
          }

Generation Details

generate -g kotlin --library multiplatform ...

Related issues/PRs

None found.

Suggest a fix

It looks straightforward - an array of bytes should be mapped to just Base64ByteArray, not List<Base64ByteArray>. Regarding place in the code, probably something around this place: https://github.com/OpenAPITools/openapi-generator/blob/b02fd28ba638a606785c952d1227f15dfd8660bf/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/KotlinClientCodegen.java#L701

Start in modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/KotlinClientCodegen.java around the referenced line, then generate the provided schema with the Kotlin multiplatform library. Confirm how an array of byte-formatted strings is mapped. Done means the generated type is Base64ByteArray rather than List.