Implemented Interaction states for Shortcut Helper

- added hover/pressed state implementations for categories and keyboard settings
- Refactored Shortcut helper surfaces to have hover/focused/pressed
  state implementations by default allowing for reuse.

Test: Manual - ensure that shortcut helper categories UI and keyboard
settings respond to hover/press/focus as shown in UI Mocks
Flag: com.android.systemui.keyboard_shortcut_helper_rewrite
Fixes: 355154005

Change-Id: Id33c15dfe6d1a63e282025d4c7286c9bf333be4d