Smaller plugin aar

[farfromrefug]

There were a ton of unecessary data added to each aar. Those data would make apps bigger and slower because they also add sbg metadata

[rigor789]

WARNING:The option 'android.enableSeparateRClassCompilation' is deprecated.
The current default is 'true'.
It has been removed from the current version of the Android Gradle plugin.
Separate R class compilation has been enabled and can no longer be disabled.

Probably something to keep in mind for the near future...

[farfromrefug]

@rigor789 indeed might not be needed with gradle 7.0