Add py.typed marker for PEP 561 support (#116)

[Tarcio0211]

Issue: #116

What this PR does:

• Adds an empty py.typed file to the permit package.
• Updates package_data in setup.py to include py.typed in the distribution.

Why:
This resolves the mypy error Skipping analyzing 'permit': missing library stubs or py.typed marker reported in issue #116. Now mypy correctly recognizes permit as a typed package.

Testing:

• Verified locally that mypy no longer ignores the permit package.
• Installed in editable mode (pip install -e .) to confirm the marker is included.

[Copilot]

Pull request overview

Adds PEP 561 typing support metadata so type checkers (e.g., mypy) recognize permit as a typed package rather than reporting it as “missing library stubs or py.typed marker”.

Changes:

• Adds an empty permit/py.typed marker file.
• Updates setup.py to include py.typed in the distributed package via package_data.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
setup.py	Includes permit/py.typed in package distribution metadata (package_data).
permit/py.typed	Adds the PEP 561 marker file to declare the package as typed.

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