Make extract_coreml_models.py buck-runnable

[derekxu]

Summary:
Add a python_binary target for extract_coreml_models.py in the BUCK file,
wrap the script's entry point in a main() function

Differential Revision: D97498856

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18371

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⏳ 3 Pending, 2 Unrelated Failures

As of commit 135fc57 with merge base fd1581d ():

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.

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[meta-codesync]

@derekxu has exported this pull request. If you are a Meta employee, you can view the originating Diff in D97498856.

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