1828 Revert “[google_sign_in] Added NonNull annotations, reduce Guava usage (#844) (cla: yes)

1830 [firebase_remote_config] fix config value source parsing (cla: yes)

1831 [firebase_crashlytics] Handle case where function isn’t in class for stack (cla: yes)

1832 [camera] Dart Interface for camera refactor (cla: yes)

1833 [in_app_purchase] add missing hashCode implementation (cla: yes)

1834 [firebase_storage] Fix Content-Type auto-detection for Android (cla: yes)

1835 [firebase_dynamic_links] Allow FDL plugin to be registered without an activity (cla: yes)

1839 [firebase_auth] CHANGELOG entry and update pubspec.yaml for release (cla: yes)