1620 [cloud_functions] Update README and dart docs, remove unused parameters. (cla: yes, flutterfire)

1621 Change LocalAuth to use Biometric API (cla: yes)

1622 Add missing import for UIKit (cla: yes)

1623 [cloud_firestore] add support for cacheSizeBytes (cla: yes, flutterfire)

1624 [webview_flutter] platform_interface: Use Dart objects for creationParams and webSettings. (cla: yes)

1625 [image_picker] Rename iOS class according to the official Objective-C naming convention. (cla: yes)

1630 [firebase_ml_vision] Add close method for detectors (cla: yes, flutterfire)

1633 [cloud_firestore] Fixed parent() methods (cla: yes)