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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[zeevmoney]

Thanks @Tarcio0211 for picking this up. The marker is exactly the right end state, and your packaging change does put py.typed in the wheel.

When we tested it against the current code, though, declaring the package typed made things worse for type-checker users on its own. mypy and pyright started flagging correct code:

• optional model fields read as required;
• the sync client (permit.sync.Permit) was typed as returning coroutines;
• API methods that accept dicts at runtime rejected them in their annotations.

On a small sample app, that turned 3 import errors, which users can silence, into more than 20 errors on valid code.

#126, now merged to main and shipping in permit 3.0.0, fixes those typing problems and ships py.typed together with them. Your change is included in it, and you're credited as co-author on the commit. So I'm closing this PR as incorporated. Thanks again for the contribution!