PyPI publishing workflow

[misi9170]

Adds a workflow to publish Hercules as a package on PyPI. Hercules would first appear on PyPI after this pull request arrives on the main branch and a new release for Hercules is created.

Set up using PyPI's Trusted Publishing workflow.

Unforunately, hercules is taken as a PyPI package name (on 0.0, with no releases since 2014.... oh well). We could alternatively publish under the following, which appear to be available:

• herc
• nlr-hercules

Any other suggestions?

[genevievestarke]

I think I would prefer nlr-hercules. And that seems consistent with naming conventions that have been used in the past!

[paulf81]

I think I would prefer nlr-hercules. And that seems consistent with naming conventions that have been used in the past!

Agree, this is better option unless we rename repo to herc

[misi9170]

Planning for nlr-hercules and I have PyPI primed to receive the package under that name. Going to delay merging this until early next week so we can decide if we want to merge this PR into develop and release a version 2.1 with various changes; or if we want to merge straight to main and release a version 2.0.1, with larger changes following in a subsequent v2.1