2127 [google_sign_in] Fix deprecated API usage issue by upgrading CocoaPod to 5.0 (cla: yes, submit queue)

2128 [image_picker] Define clang module for iOS (cla: yes)

2131 [share]fix iOS crash when setting the subject to null (cla: yes)

2135 [android_alarm_manager] Define clang module for iOS (cla: yes)

2136 [url_launcher_web] Fix README.md pubspec example (cla: yes)

2137 [connectivity] Define clang module for iOS (cla: yes)

2138 [device_info] Define clang module for iOS (cla: yes)

2139 [google_maps_flutter] Add NonNull macro to reduce warnings in iOS (cla: yes)