Support highlighting the menu entry for Search results

1. Add a receiver to monitor the search state
2. Shoe/hide the menu highlight in the listener
3. Highlight the menu entry in SearchResultTrampoline
4. Enable/disable the receiver in SettingsInitialize

Bug: 205781792
Test: manual, robotest
Change-Id: Ia04901f504172f4f0c7b4b2ea7eda5f3713f676d