Cancel ongoing touchpad move gesture if user starts typing

To improve touchpad palm rejection while typing, this change will cancel
any ongoing touchpad move gesture if user starts typing on keyboard. In
this change we:
1. Introduce a new flag to gaurd this change
2. Add behaviour to cancel ongoing gesture

Bug: 301055381
Test: atest inputflinger_tests
Change-Id: I0830cb24f2046380e140cddd71096b8a611c51de