1372 [image_picker] fix “Cancel button not visible in gallery, if camera was accessed first” (bugfix, cla: yes)

1373 [shared_preferences] Add contains method (cla: yes, feature)

1374 Update CONTRIBUTING.md with test info (cla: yes)

1375 Add pull request template (cla: yes)

1377 [firebase_admob] Update documentation to add iOS Admob ID & add iOS Admob ID in example project (cla: yes, documentation, flutterfire)

1378 [firebase_crashlytics] Support compatibility with Swift plugins (cla: yes)

1379 [firebase_crashlytics] Upgrade dependencies (cla: yes)

1380 [in_app_purchase]load purchase (cla: yes, feature)