[build] Add cpp_extension.py and publicly link torch.so

[larryliu0820]

Stack from ghstack (oldest at bottom):

• Add wrapper code to wrap an ET kernel into an ATen kernel #2186
• Add CMakeLists.txt to run GTEST for runtime/kernel/test #2185
• Refactor make_boxed_from_unboxed_functor.h #2184
• ->[build] Add cpp_extension.py and publicly link torch.so #2183
• [kernel] Add template based unboxing #1284
• [llm] Install examples/ in python #2003

Summary:

Test Plan:

Reviewers:

Subscribers:

Tasks:

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Differential Revision: D54394151

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/2183

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 5e4d050 with merge base e2a8f95 ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for extension/pybindings/cpp_extension.py:

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 / linux (buck2) / linux-job (gh)
  RuntimeError: Expected to find "executorch_exir_dialects_edge__ops_aten_relu_default" but did not find it

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[larryliu0820]

@larryliu0820 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[iseeyuan]

Is there a test on load_inline?

[cccclai]

Close stale PR