Refactor: shift shortcut logging logic to IMS from PWM

As part of the refactoring, we are bringing shortcut trigger and
handling in PWM and rest should be in IMS.
This also allows us to define callbacks from InputManager to SysUI
when a shortcut is triggered and allowing other system components
to provide UI hints and feedback when shortcuts are triggered.

Bug: 351770951
Test: None (Refactoring)
Flag: EXEMPT refactor
Change-Id: Id9df802fbd76383442d6c39c9c649b7f643a8957