Add APIs to fetch Method and Tensor metadata.

[shoumikhin]

Summary: .

Differential Revision: D75482349

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 717ee30 with merge base 42519db ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts

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This pull request was exported from Phabricator. Differential Revision: D75482349