3280 Fix broken link (cla: yes)

3286 [file_selector] Replace locally defined XFile type with cross_file package (cla: yes)

3287 [in_app_purchase] Added serviceTimeout code (cla: yes, waiting for tree to go green)

3288 [android_alarm_manager] fix AndroidManifest.xml for android lint issue “XML tag has empty body” (cla: yes)

3295 bump integration test to 1.0.0 (cla: yes)

3299 [camera] Support Android 30 (cla: yes)

3302 [camera] Add implementations for camera_platform_interface package. (cla: yes, feature)

3303 [connectivity] Clear networkCallback object as soon as stream is cancelled (cla: yes)