Support for Model API for Selective Build in OSS

[BujSet]

Summary

Added support for parsing the selected operators and dtypes directly from an exported model to a selected_operators.yaml file. Previously, operators had to be specified in string list or in a schema yaml file for the selective build process. Now, a model can be specified at build time (e.g. -DEXECUTORCH_SELECT_OPS_FROM_MODEL="./mv2.pte") to parse and select operators.

Test plan

Added a test for this in examples/selective_build/test_selective_build.sh. When run with bash examples/selective_build/test_selective_build.sh cmake a resultant selected_operators.yaml file is created at cmake-out/examples/selective_build/select_build_lib/selected_operators.yaml that conatins the selected operators as well as their dtypes.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11601

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⏳ 2 Pending, 1 Unrelated Failure

As of commit 76ec14f with merge base 8895573 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-eval_llama-wikitext-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[BujSet]

@pytorchbot label "release notes: none"

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[lucylq]

Looks great, thanks for adding this!