[14/n Dispatcher refactor] Move TouchState methods

In this CL we move or create following TouchState related methods to the
TouchState class:
1. clear
2. isPointerInWindow
3. hasTouchingOrHoveringPointers
4. removeAllPointersForDevice
5. dump

This CL also updates InputDispatcherUserActivityPokeTests to use current
time to inject events, to avoid them being dropped as stale.

Bug: 367661487
Bug: 245989146
Test: atest inputflinger_tests
Flag: EXEMPT refactor
Change-Id: I624700a78471a85a1e97c06b170137ee4e6ddf82