Introduce data schema to store raw tensors

[lucylq]

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/6540 ^ 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/lucylq/12/base ghstack PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/12/head Merge bot PR base: https://github.com/pytorch/executorch/tree/main Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/12/orig @diff-train-skip-merge

[pytorch-bot[bot]]

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