Example kernel for '[RFC] Scope for Custom Operator extension'

[DenisVieriu97]

Example of custom operator for [RFC] Scope for Custom Operator extension.

Note that all core changes have been stripped out as these are currently under discussion.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/1358

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❌ 4 New Failures

As of commit ee76157 with merge base fcf87ba ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / test-custom-ops-linux (cmake) / linux-job (gh)
  RuntimeError: Command docker exec -t a260ca2bf9ad5fc7c2b24a5f8e70cae1ba8f180737b31079d4da6175de227547 /exec failed with exit code 1
• pull / test-selective-build-linux (buck2) / linux-job (gh)
  RuntimeError: Command docker exec -t 69bdd3507fc372a6f3ba1df9bb3c08cff8a5a76f43e48cc59b3afda527e29330 /exec failed with exit code 3
• pull / test-selective-build-linux (cmake) / linux-job (gh)
  undefined reference to custom::native::mps_softshrink_out_impl(torch::executor::KernelRuntimeContext&, torch::executor::Tensor const&, double, torch::executor::Tensor&)'`

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Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
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