1/n refactoring TouchpadGestureHandler

TouchpadGestureHandler is now simlpified to TouchpadEventsFilter and it's easier to use, without a need to create wrapper object which needs to be recreated for every change in recognizer

Bug: 384509663
Test: TouchpadEventsFilterTest
Flag: com.android.systemui.shared.new_touchpad_gestures_tutorial
Change-Id: Iacf6797caa4613f960c4bd1c5d39201bb03c50fe