7974 Android Embedding PR 12: Add lifecycle methods to FlutterActivity. (cla: yes)

7975 [macos] Add hover support to FLEViewController (cla: yes)

7978 Refactor web configuration/ Add dartdevc (cla: yes)

7979 Android Embedding PR 13: Integrated text input, keyevent input, and some other channel comms in FlutterView. (cla: yes)

7982 Fix deleting text when the last character is some special characters on IOS (cla: yes)

7985 Add async events to pipeline flows. (cla: yes)

7986 Check for a null pressure range for motion events (cla: yes)

7988 Provide batching for semantics updates (cla: yes)

7990 Improve performance of Locale.toString (cla: yes)