[ET-VK] Cache compiled SPIR-V and only recompile when changed (#9701)

This PR was created by the merge bot to help merge the original PR into
the main branch.
ghstack PR number: https://github.com/pytorch/executorch/pull/9652 by
@SS-JIA
^ Please use this as the source of truth for the PR details, comments,
and reviews
ghstack PR base:
https://github.com/pytorch/executorch/tree/gh/SS-JIA/202/base
ghstack PR head:
https://github.com/pytorch/executorch/tree/gh/SS-JIA/202/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head:
https://github.com/pytorch/executorch/tree/gh/SS-JIA/202/orig
@diff-train-skip-merge

Co-authored-by: Stephen Jia <ssjia@meta.com>