[FEATURE] Add py.typed marker

Your project has inline type hints and you don't provide stubs, so according to the [PEP documentation](https://peps.python.org/pep-0561/#packaging-type-information) you need to add `py.typed` marker in project.

Do following fix to provide types for type checkers (like mypy):

setup.py
```python
setup(
...
package_data={name: ["py.typed"]},
...
)
```

In bash
```bash
touch cfpq_data/py.typed
```