add msys2 capabilities

[Kreijstal]

same reason as saulpw/visidata#2757

[aisk]

Since we are using poetry instead of setuptools, setup.py should not be added. We should done this in pyproject.toml with environment markers: https://python-poetry.org/docs/dependency-specification/

[Kreijstal]

A pure Poetry solution using standard environment markers is insufficient for this specific use case because the markers cannot differentiate between a native Windows environment and an MSYS2 environment.