1395 Add Crashlytics plugin to opensource list (cla: yes, flutterfire, submit queue)

1398 [firebase_auth]Fix PhoneCodeAuthRetrievalTimeout callback never called (bugfix, cla: yes, flutterfire)

1404 Bump version to 0.4.1+5 (cla: yes)

1405 [firebase_messaging] Additional step for iOS (cla: yes, documentation, flutterfire)

1406 [webview_flutter] Add initial e2e tests (cla: yes, feature, webview)

1407 [firebase_crashlytics] Update README code example (cla: yes, documentation, flutterfire)

1409 [google_maps] Add initial google_maps tests (cla: yes)

1410 [android_alarm_manager] add type params for invokeMethod calls. (cla: yes)