[executorch][core] NamedDataMap interface

[lucylq]

Stack from ghstack (oldest at bottom):

• [executorch] Add program-data separation example to test files #7765
• [executorch][flat_tensor] flat tensor header #7764
• -> [executorch][core] NamedDataMap interface #7763
• [executorch][core] Add TensorLayout to core #7761
• [executorch][serialization] Serialize PTD files. #7270
• [executorch][flat_tensor] Serialize flat tensor tests #7269

Add NamedDataMap interface to runtime.

Differential Revision: D66834552

[pytorch-bot]

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❌ 2 New Failures

As of commit c81d8cf with merge base 8494b90 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 0a0d353afa0f48a77f87c4e4142b2847467f15f4b519758ef94a7613e42f7ff5 /exec failed with exit code 2

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This pull request was exported from Phabricator. Differential Revision: D66834552

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