Brawlify: Implement Game Data API endpoints

[y9vad9]

Description

For now, due to the nature of non-stability of Game Data (Raw Files) API, this library does not support it. In addition in requires some time for exploring without much value for most people.

Mostly, I am not aiming to close this issue myself, but if somebody likes this library and can implement this API – Contributions are welcome.

Implementation

Because of dynamic nature of these endpoints, the solution I see is wrapper around JsonArray/JsonObject with RequiresOptIn annotation on such API. All fields that are present in the API (if they're unstable), should be extensions with stability marker. It will make able for other to use library for this endpoint even though we may not be able to fix something on-time.