Update flat tensor ndm to account for named delegate data

[lucylq]

Stack from ghstack (oldest at bottom):

• -> #10330
• #10328

Currently flat_tensor ndm only accounts for tensors in get_data, get_num_keys, get_key functions.

Add support to return named_data values as well.

TODO: consolidate tensors and named_data into one structure in the flatbuffer. This will simplify all the serialization and runtime code.

Currently, we assume that a PTD file has either tensors or named_data, not both. After the consolidation, this won't be an issue.

Differential Revision: D73380805

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10330

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:x: 6 New Failures

As of commit 75cc0e625e620a7a85caf4e5d7a7419ed0bde701 with merge base 334af4a1a338a9a37a4e5f0830cc37d83d6a5681 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh) >>> Lint for backends/cadence/aot/tests/test_replace_ops_passes.py:
• Propose to merge ghstack orig PRs to main / Try to create a PR with ghstack /orig branch (gh) Process completed with exit code 1.
• pull / unittest / linux / linux-job (gh) [ FAILED ] FlatTensorDataMapTest.FlatTensorDataMap_Keys_Xnnpack
• pull / unittest / macos / macos-job (gh) [ FAILED ] FlatTensorDataMapTest.FlatTensorDataMap_Keys_Xnnpack
• pull / unittest-editable / linux / linux-job (gh) [ FAILED ] FlatTensorDataMapTest.FlatTensorDataMap_Keys_Xnnpack
• pull / unittest-editable / macos / macos-job (gh) [ FAILED ] FlatTensorDataMapTest.FlatTensorDataMap_Keys_Xnnpack

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D73380805

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D73380805