Introduce graph interface over serialization

[metascroy]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20704

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❌ 3 New Failures

As of commit d839830 with merge base 48a87f9 ():

NEW FAILURES - The following jobs have failed:

• pull / test-arm-backend-no-driver (test_pytest_models_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 980728a03a0a7a53d155120d4f025943dd167890c9b187b006fc97bf507574c7 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t eacab3dfb3cddb6f57f14a50bddf248fbe4290da7f05a9ddeaeb848c0a04fae2 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t c2ef3f3eafa61df66c24c4509d9ebc49d8c076b0a9661c07c2af49fcf1e4e043 /exec failed with exit code 1

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