Shift App launch shortcut handling to KeyGestureController

As pre requisite to custom shortcut implementation, we need to move
all shortcut handling to input (KeyGestureController) from PWM.

Bug: 358569822
Test: atest KeyGestureControllerTests
Test: atest ModifierShortcutTests
Flag: com.android.hardware.input.use_key_gesture_event_handler
Change-Id: If07bb66a5615faccd8251d70f8ae68bd19ad1b7a