3492 [image_picker_platform_interface] migrate to nnbd  (cla: yes, nnbd, p: image_picker, waiting for tree to go green)

3524 [image_picker] Migrate to null-safety (cla: yes, nnbd, p: image_picker)

3534 Update example pubspecs to match templates (cla: yes, p: android_alarm_manager, p: android_intent, p: battery, p: camera, p: connectivity, p: device_info, p: google_maps_flutter, p: google_sign_in, p: image_picker, p: in_app_purchase, p: integration_test, p: local_auth, p: package_info, p: path_provider, p: quick_actions, p: sensors, p: share, p: shared_preferences, p: url_launcher, p: video_player, platform-linux, platform-macos, platform-windows)