[TIMOB-28187] Android: Add C/C++ "prefab" support to Titanium AAR

*Summary:* Android Gradle Plugin v4.0.0 added the ability to import C/C++ "Prefab" packages from AAR libraries. This allows us to bundle C/C++ header files into the Titanium AAR for module builds instead of installing a separate ./android/native folder on the system. https://developer.android.com/studio/build/native-dependencies https://google.github.io/prefab/ *Note:* This is intended to simplify module builds and makefile generation. The C/C++ header files bundled into the Titanium AAR will not end up in the app's built APK.