Allow PUBLIC visibility and make it the default

[swolchok]

IMO we don't have a particular reason to lock down visibility by default.

Differential Revision: D82156686

[swolchok]

Stack from ghstack (oldest at bottom):

• buck query most of //backends/arm in CI #14157
• backends/arm buck fixup #14156
• runtime_wrapper: remove caffe2 deps from python libraries so we can at least use buck query #14155
• Migrate from cpp_python_extension to runtime.cxx_python_extension #14154
• Mass migrate to runtime.python_library #14153
• -> Allow PUBLIC visibility and make it the default #14181

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14181

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 1 Cancelled Job, 4 Unrelated Failures

As of commit 1decdae with merge base 53b7ec5 ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-binary-size-linux-gcc / linux-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-samsung-models-linux / linux-job (gh) (similar failure)
• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)

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

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

• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)

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[swolchok]

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[swolchok]

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[swolchok]

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[github-actions]

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[swolchok]

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[swolchok]

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