[Executorch][llm] Add support for ring kv cache and ring attention #10832
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Pull Request resolved: #10608 Introduced CachePositionManager to keep track of what is the position for each slot in ring kv cache. This is used to generate mask. ghstack-source-id: 283404678 @exported-using-ghexport Differential Revision: [D73891427](https://our.internmc.facebook.com/intern/diff/D73891427/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10832
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #10608 by @kimishpatel
^ 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/kimishpatel/185/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/185/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/185/orig
@diff-train-skip-merge