use the library version number to publish to pypi, create a git tag and define a github release

[ajmirsky]

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Changes included in this PR

Depending on the project release process, hopefully this change to the publish-to-pypi github workflow will keep things consistent. After the project is published to pypi based on the version number in pyproject.toml, the same value is used to create a tag and a github release.

Impact

Keeps the version number consistent across pypi, git tag and github release by using the version number from pyproject.toml.

Checklist

tested additional functionality separately in a different repo, but since I don't have access to publish to pypi, I can't test the full flow.