Enable macos clang-tidy installs

[1ntEgr8]

This PR enables installing our custom MacOS clang-tidy binaries. It also updates related documentation.

The binaries are produced by this CI job, and are published to S3.

This PR does not handle versioning of the downloaded binaries as this is being worked on separately. See pytorch/test-infra#73

Test Plan:
On a MacOS machine, run

python3 -m tools.linter.install.clang_tidy
.clang-tidy-bin/clang-tidy --checks="*" --list-checks | grep "misc-max-tokens"

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🔗 Helpful links

• 🧪 See artifacts and rendered test results at hud.pytorch.org/pr/62214
• 📄 Preview docs built from this PR

💊 CI failures summary and remediations

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[janeyx99]

I ran it locally, and got:

janeyx@janeyx-mbp pytorch % python3 -m tools.linter.install.clang_tidy
.clang-tidy-bin/clang-tidy --checks="*" --list-checks | grep "misc-max-tokens"

Downloading clang-tidy to /Users/janeyx/pytorch/.clang-tidy-bin
0% |################################################################| 100%
Using clang-tidy located at /Users/janeyx/pytorch/.clang-tidy-bin/clang-tidy
    misc-max-tokens

which I believe is correct.

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[driazati]

LGTM either way on instructions

[driazati]

We use the Makefile below and these are encoded in make setup_lint, should we suggest that here instead of running the steps manually? It installs some other packages for the other linters but devs probably want those anyways

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@1ntEgr8 merged this pull request in 2a83f24.