Move touch blocking into InputDispatcher

Remove the InputHandle from ActivityRecordInputSink and instead set
NO_INPUT_CHANNEL and let InputDispatcher drop the touches.

When touches are blocked InputDispatcher logs something like:
03-04 11:36:46.974 16299 16431 W InputDispatcher: Not sending touch gesture to f619bcf ActivityRecordInputSink .FocusTouchActivity because it is not responsive
03-04 11:36:47.155 16299 16431 W InputDispatcher: Not sending touch gesture to f619bcf ActivityRecordInputSink .FocusTouchActivity because it is not responsive

Bug: 194480991
Bug: 222292477
Test: Manually tested that blocking still works
Test: atest android.server.wm.WindowUntrustedTouchTest
Test: atest InputSurfacesTest
Change-Id: If7d9503cb573fbd56f6f9e9eb2dee6298ac1f948