22004 Revert “Reland: Use dispatchKeyEventPreIme, and handle keys sent to InputConnection.sendKeyEvent on Android (#21979)” (cla: yes, platform-android)

22171 [flutter_releases] Flutter 1.22.3 engine cherrypicks (cla: yes, platform-android, platform-ios)

22179 Split AOT Android Embedder and shell (cla: yes, platform-android, platform-ios, waiting for tree to go green)

22203 Fix some serious lifecycle bugs with Android embedding code (cla: yes, platform-android, waiting for tree to go green)

22205 makes android semanticsnode to ignore hittest if it is not focusable (cla: yes, platform-android, waiting for tree to go green)