Added Hardcoded Input Shortcuts

+ moved all input shortcuts retrieval logic to InputShortcutsSource
  Class

Test: atest ShortcutHelperCategoriesInteractorTest
Flag: com.android.systemui.keyboard_shortcut_helper_rewrite
Bug: 341045650

Change-Id: Id926cb37529542a56e0130af5882cc955cffbc96
11 files changed