[Functionalization] Lower as_strided_scatter properly (#4770)
Summary:
The current lowering of as_strided_scatter is using a hack that utilize our old view infra to reapply value updates to the base view. Let's lower it properly by using AsStridedViewUpdate.
Test Plan:
PJRT_DEVICE=CPU python ../test/test_view_ops.py -v -k TestViewOpsXLA.test_as_strided
