Request: adding type hints

[jamesbraza]

Is your feature request related to a problem? Please describe.

Running mypy==1.9.0 with PyMuPDF==1.24.1:

foo.py:12:1: error: Skipping analyzing "fitz": module is installed, but missing library stubs or py.typed marker  [import-untyped]
    import fitz
    ^

Describe the solution you'd like

It would be nice to:

• Add type hints
• Add py.typed metadata

Describe alternatives you've considered

N/a

Additional context

Thank you in advance 👍

[julian-smith-artifex-com]

We are looking at possible architectural changes that will allow better type hints in future. But it's quite an involved process so there are no timescales at the moment.

[JorjMcKie]

Duplicate of #2883.