plugins#1159: [firebase_auth] Enable passwordless sign in

plugins#1487: [firebase_auth] Migrate FlutterAuthPlugin from deprecated APIs

plugins#1443: [firebase_core] Use Gradle BoM with firebase_core

plugins#1427: [firebase_crashlytics] Do not break debug log formatting.

plugins#1437: [firebase_crashlytics] Fix to Initialize Fabric

plugins#1096 :[firebase_database]Return error message from DatabaseError#toString()

plugins#1532: [firebase_messaging] remove obsolete docs instruction

plugins#1405: [firebase_messaging] Additional step for iOS

plugins#1353: [firebase_messaging] Update example

plugins#1223: [firebase_ml_vision] Fix crash when scanning URL QR-code on iOS