Shortcut Helper - UI for Categories

- Implements single and dual pane UI for categories
- Categories are hard coded for now
- Also fixes an issue with the bottom sheet height

Bug: 340819657
Test: Manually - See screenshots and videos
Flag: ACONFIG com.android.systemui.keyboard_shortcut_helper_rewrite DEVELOPMENT
Change-Id: I821249afb45c958130ee9733e461a2f08aad8c64