2371 [google_sign_in] Migrate to new pubspec plugins schema (cla: yes)

2372 [path_provider_macos] Fix publish warnings (cla: yes)

2373 Disable stable for check publish (cla: yes)

2374 [url_launcher_web] Add a no-op android/ folder (cla: yes)

2375 [sensors]Cancel sensors example timer avoid exception (cla: yes)

2376 [flutter_plugin_android_lifecycle] Add example notice like android_intent_example (cla: yes)

2378 [url_launcher_web] bump the minimal flutter requirement to 1.10.0 (cla: yes)

2382 Update all pubspecs to work with the latest version of pub and Flutter (cla: yes)