1437 [firebase_crashlytics] Fix to Initialize Fabric (cla: yes, submit queue)

1438 [google_sign_in] Handle null check in example app (cla: yes)

1439 [battery] Update example in README.md (cla: yes)

1440 [image_picker] Check camera permissions and return error (cla: yes)

1441 [google_maps] Update android gradle version (cla: yes)

1442 [google_maps] Add tests for rotate tilt and zoom gestures (cla: yes)

1443 [firebase_core] Use Gradle BoM with firebase_core (cla: yes, flutterfire)

1444 [firebase_crashlytics] Added a simple integration test (cla: yes)