TouchInteractionController: cache motion events when transitioning between states.

When transitioning between states, TouchInteractionController will queue motion events  and not deliver them until the state transition has been confirmed.
This avoids the case where a service will request a state transition twice because it processes a motion event after sending the transition request but before the transition completes.
Bug: 159651900
Test: atest TouchInteractionControllerTest

Change-Id: I2437b635a8053de28212d93e67c7144134c1dc08