Move touch classes out of dream package.

This change moves touch-related functionality out of the dream touch
package and into the ambient touch package.

Test: atest TouchMonitorTest
Test: atest BouncerlessScrimControllerTest
Test: atest ScrimManagerTest
Test: atest BouncerSwipeTouchHandlerTest
Test: atest CommunalTouchHandlerTest
Test: atest ShadeTouchHandlerTest
Test: atest DreamOverlayServiceTest
Flag: N/A
Bug: 333885071
Change-Id: Ib812ec5f8ec2cd71507b0c4938849503e7518b8d