Create spec files from local packages

[befeleme]

User journey:

• they have a directory with a Python package (it's not important whether it's a git repository or not)
• they build the package using standard methods (e.g. python -m build). We expect sdist and wheel to be built.
• they point pyp2spec to a directory in which there are the built artifacts

pyp2spec:

• reads the metadata from the wheel archive
• uses the resulting artifacts names to determine the archfulness
• creates a specfile based on the above mentioned data

pyp2spec never attempts to build or install anything on a user machine. If the project is not buildable as a Python distribution, it won't be buildable as an RPM.