refactor(MultiFingerMultiTap): Create a list to collect all gestures and...

refactor(MultiFingerMultiTap): Create a list to collect all gestures and finally send them to the GesturesObserver

This refactor to  makes us easy to monitor new gestures in the codebase with flags.

Bug: 297805269
Test: manual
Test: atest WindowMagnificationGestureHandlerTest
Change-Id: I6dd3a37231f3563d5b79b7a6a675215729553559