[TIMOB-24470] Android: Fails to build modules that contain additional java files inside plugins folder or test folders not intended to be in distributed module

Some modules (such as our own hyperloop.next module for Android) may contain *.java files not intended for distribution/compilation in the module. Specifically, I have a java source file in the plugins hook that gets compiled at runtime, but doesn't go in the module binary itself. I also have some text code in a test-src folder. Our CLI currently scans the project directory for *all* java files, but really should only gather the src/**/*.java files and build/generated/**/*.java files.