Refresh infra-structure and support cython 3.x

[bjlittle]

This pull-request gives some well overdue ❤️ to mo_pack, breathing life back into repo and allowing it to build and test against py312.

In a nutshell, the changes include:

• Uses a modern .gitignore for python, see here
• Adopting auto-versioning with setuptools-scm
• Adopts assorted developer and best practice pre-commit hooks
• Configures pytest for testing
• Refreshes the README.md
• Adopts PEP 621 for storing project metadata in the pyproject.toml
• Adopts PEP 517 and PEP 518
• Adopts NEP 029 and the Drop Schedule
• Captures the package conda requirements in requirements/mo_pack.yml
• Refreshes the setup.py to work with cython 3.x
• Introduces an minimum pin of cython>=3
• Purges legacy python 2.x future imports
• For continuous-integration:
  • Enables the pre-commit.ci service for the repo
  • Adopts use of dependabot
  • Checks the manifest of the sdist
  • Builds and tests mo_pack with py39, py310, py311 and py312

[bjlittle]

As this PR initiates bootstrapping the GHA CI, see https://github.com/bjlittle/mo_pack/actions for the successful CI job runs associated with the PR branch.

[bjlittle]

FYI @jfrost-mo

[bjlittle]

Once this PR lands, I'll cut a release and then update the conda-forge feedstock with a new PR.

I'm currently not a maintainer of this package on the feedstock, but was going to add my name to the list and ping @ocefpaf for a merge.

@trexfeathers did you want me to also add you as a feedstock maintainer to cover the bases?

[trexfeathers]

@trexfeathers did you want me to also add you as a feedstock maintainer to cover the bases?

I guess so 🙈

[trexfeathers]

@HGWright and @trexfeathers are sharing review duties.

[HGWright]

Just a couple of minor changes to consider. Thanks for the CI refresh!

[bjlittle]

@HGWright See https://github.com/bjlittle/mo_pack/actions for the GHA runs on the PR branch

[HGWright]

Thanks!

[bjlittle]

@trexfeathers I think we're good to roll with this now ...

[trexfeathers]

Thanks for the poke.

I am also happy with the pieces I reviewed.

[bjlittle]

Sweet!

Thanks guys. I'll cut a release later this afternoon and push a change to the feedstock afterwards 🥳