Refactor ShortcutManager to ModifierShortcutManager

The ModifierShortcutManager will manage 'shortcut key -> Intent'
handling or notify IShortcutKeyService invoked by modifier keys+
(meta, alt, ctrl shift or search) shortcut.

This's different to KeyCombinationManager, the ModifierShortcutManager
will check the modifier key state and the modifier key should be
pressed first. And the key event would still continue dispatching to
the app side without any pending. If it's handled, the app side would
recevie the key canceled event.

- Rename ShortcutManager to ModifierShortcutManager.
- Move shortcuts that are invoked by search key + key.
- Move shortcuts that are invoked by meta key (alt, ctrl, meta, shift)+.
- Move shortcut to IShortcutService to ModifierShortcutManager.
- Move special keys that are used to launch particular kinds of
  applications to ModifierShortcutManager.

Test: manual with connected keyboard
Bug: 162194917
Bug: 127687575
Change-Id: I55ad50848976120984d797a69765241030644ce3