Create an action to publish to pypi when we make a release

[mattldawson]

Add an action that publishes the MUSICA Python wrapper to pypi for each release.

Acceptance Criteria

• The MUSICA Python package is deployed to pypi on each commit to the release branch

Ideas

• Follow the logic here and here
• Investigate whether it's possible to have the version number in just one place, instead of in both the CMakeLists.txt file and pyproject.toml