Add py.typed file for type hint recognition

[MuddyHope]

Summary

Add a py.typed file to the package root. This allows static type checkers (like MyPy) to recognize and validate type hints in pyquerytracker.

Details

• Create an empty file named py.typed in the main package directory.
• Ensure it is included in the package distribution (e.g., via MANIFEST.in or setup.cfg if used).
• This will make type hints available to users and tools.

References

• PEP 561: Distributing and Packaging Type Information

Additional context

This is a common best practice for typed Python packages and helps improve static analysis and developer experience.