1139 WebView JavaScript channels - iOS implementation. (cla: yes)

1140 Change iOS video format back to bgra8888 (cla: yes)

1147 [In_app_purchase] Use json serializer for skproduct wrapper and related classes. (cla: yes)

1148 Update NSNull check with directly checking the expected type.  (cla: yes)

1149 Allow clearing cookies for FlutterWebView (cla: yes)

1155 Updating the example to match the new API (cla: yes, documentation, flutterfire, submit queue)

1156 Add capability of using single plane buffers (cla: yes)

1157 Workaround to fix the camera positioning issue on the google map view (cla: yes)

1161 Add Swift example to README.md for google_maps_flutter (cla: yes)