Android Gradle Project for COIN

Minimal Android project used at provisioning time to pre-cache the Gradle dependencies. This avoids network downloads during Qt builds and tests which use --offline.

Caches dependencies for:

com.android.application: used by Qt test/example APK builds
com.android.library: used by Qt JAR builds
org.jetbrains.kotlin.android: used by some Qt modules
AndroidX: used by app builds

These files should be updated each time Qt bumps the supported Android or Gradle versions.