[google_maps_flutter_android] Convert <PlatformTile, TileOverlay> to Pigeon #152927
Description
Child task of #117907
Example pull request flutter/packages#7207
Inital code pointer
https://github.com/flutter/packages/blob/82e8d1eecb4518a28083d7c10bd677d06574f9e6/packages/google_maps_flutter/google_maps_flutter_android/pigeons/messages.dart#L33-L121