Create PyPI installable package for the Python library

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1874678

It would be useful to have the python/qemu/ files published as a Python 
pip package, so users from distribution can also use the QEMU python 
methods (in particular for testing) without having to clone the full 
repository.

Edited May 06, 2021 by John Snow

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