Add flag for accessibility services to request that double tap gestures be...

Add flag for accessibility services to request that double tap gestures be dispatched to the service.

When disabled, double tap and double tap and hold will be handled by the framework. Specifically, they will perform ACTION_CLICK and ACTION_LONG_CLICK on the item with accessibility focus.

Bug: 136131815
Test:  atest GestureManifoldTest TouchExplorerTest  AccessibilityGestureDetectorTest
Change-Id: I19f8f2650e383f136ae9f4d0423d86721c27265b