[REQ] Kotlin: Support array responses

Is your feature request related to a problem? Please describe.

The actual implementation with moshi dont support array responses

[
  {"text": "hello"},
  {"text": "hello"}
]

Describe the solution you'd like

To parse a JSON array to a list, moshi recommand this approach in order get a List

val listType = Types.newParameterizedType(List::class.java, Person::class.java)
val adapter: JsonAdapter<List<Person>> = moshi.adapter(listType)
val result = adapter.fromJson(reader)

I think modifing the ApiClient.mustache and the method responseBody would be necesarry

Describe alternatives you've considered

Another fix that i have in my mind would be to create a wrapper for the array response, and create this wrapper inside Kotlin client.
something like this:
{"response": [ {"text": "hello"}, {"text": "hello"} ]}

And then return the response as a result of the responseBody inside ApiClient.mustache

Start with the Kotlin ApiClient.mustache template and its responseBody method. Trace how an array response is converted into a Moshi adapter, then verify that a generated Kotlin client can deserialize the example JSON array into a List; done means array responses work without requiring a wrapper object.