Allow gesture blocking by activity type.

This changelist adds another way activities can have gestures blocked by
activity type. This blocking is done globally for all top activities of
a given type. This changelist also utilizes this functionality for
dreams via the DreamOverlayService.

Test: atest DreamOverlayServiceTest#testDreamActivityGesturesBlockedWhenDreaming
Test: atest GestureInteractorTest
Test: atest GestureRepositoryTest
Test: atest TaskmatcherTest
Flag: EXEMPT bugfix
Fixes: 333734282
Change-Id: I882726aa01ea36fba25316a8e368251ae793bd86