Shortcut Helper - Implement search

+ Filters shortcuts based on labels / descriptions
+ Removes categories that don't have any match
+ Makes

Test: ShortcutHelperViewModelTest.kt
Test: Manually
Fixes: 341045433
Flag: com.android.systemui.keyboard_shortcut_helper_rewrite
Change-Id: I47620f8d9beffd07572ad0dcb98a8c25ee566315