[Android] Implement launcher zoom callback

[patzly]

Added launcher zoom callback for live wallpapers introduced in API 30, closes #7055.
It's basically the same structure as the existing onOffsetsChanged() so I copied the important methods and modified them accordingly. Hope I've done all right!

[patzly]

The build check keeps failing without a helpful explanation this time and I think my code and code style is correct...
Can someone help please? Or is the check maybe not required to succeed when all seems to be correct?

[SimonIT]

2023-08-13T15:58:52.8444540Z   - Gradle detected a problem with the following location: '/home/runner/work/libgdx/libgdx/tests/gdx-tests-android/build/intermediates/packaged_manifests/debug'. Reason: Task ':tests:gdx-tests-android:processDebugResources' uses this output of task ':fetchNatives' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed. Please refer to https://docs.gradle.org/7.5.1/userguide/validation_problems.html#implicit_dependency for more details about this problem.
2023-08-13T15:58:53.4431717Z /home/runner/work/libgdx/libgdx/tests/gdx-tests-android/src/com/badlogic/gdx/tests/android/LiveWallpaper.java:41: error: MyLiveWallpaperListener is not abstract and does not override abstract method zoomChange(float) in AndroidWallpaperListener
2023-08-13T15:58:53.4432263Z 

You must also adapt the tests to your changes

[patzly]

Thanks I already looked for Android tests but Android Studio showed me somehow an empty folder, had to go into Project view... Now it should be fine!

[intrigus]

This comment is either outdated or wrong as this isn't repeated in Engine.onResume?

[patzly]

I indeed forgot some calls of the new method, now it should be all right!

[patzly]

@SimonIT I think someone with write access has to resolve the remaining conflict in the changelog caused by another listed change for Android. Thanks!