[native] Memoize PanGestureHandler props in SwipeableMessage

Summary:
Based on flamegraph from profiler, it looks like A. creating SwipeSnakes and PanGestureHandler in SwipeableMessage is expensive B. because we're not memoizing things as carefully as we could be we're eating this cost multiple times.

In this diff I just memoize the PanGestureHandler props. In the subsequent diff I'll add some more memoization to this component specifically wrt the SwipeSnakes

Depends on D9052

Test Plan:
"Before":

Will do another round of profiling after the subsequent diff to show improvement.

Reviewers: ginsu, tomek, rohan

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D9053