Arm backend: Add running manifest to track public API

[Sebastian-Larsson]

Add a manifest file that tracks the state of the public API. This will acts as a current snapshot of what the public API looks like. This manifest file can then be used in future scripts and tests to make sure that a commit does not break the API without proper deprecation.

For each release of Executorch there will be a static manifest file generated from the "running" manifest. Those manifest files will be immutable.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @robell

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18528

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❌ 3 New Failures, 3 Unrelated Failures

As of commit 9f32da1 with merge base b6824d1 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-editable / linux / linux-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_qs8_conv2d_bn
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model
• trunk / test-arm-backend-vkml (test_pytest_ops_vkml) / linux-job (gh)
  RuntimeError: Command docker exec -t a4650cc17dbdef82e7747498294fd2d401d1df9352bf56ed368c01e6124f72d2 /exec failed with exit code 1

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[Sebastian-Larsson]

Unrelated CI failures. The Arm failure is an unrelated as well, it's a regression from a previous patch.