Upgrade to pyproject, bump pyupgrade

[asears]

This PR uplifts the project a bit. ++ @carltongibson

• Upgrade to pyproject.toml from setup.cfg and tox.ini
• Add pytest-cov test coverage settings
• bump pyupgrade version
• Add workflow dispatch to allow for tests workflow to be called on demand
• Add permissions to test workflow as per good security practice
  - Comment the gitignore, add coverage exclusions
• Added some testing dependencies
• Added some project URLs

This PR will need a test by someone familiar with the release process and review of the settings for pypi release.

Some further improvements could be made:

• Add black, flake8, pytest, coverage, security scans to a build pipeline for inline visibility on pr/comments on prs.
• Some flake8 & ruff warnings to adjust/address
• One file needs format in the repo according to latest black.
• If some contributors are testing builds with uv, requires an extra couple lines added to pyproject to allow a wheel build.
• ruff could be added for future to replace need for isort, black, flake8, flake8-bugbear and autofix issues

[bigfootjon]

@carltongibson, how do you feel about these changes? These seem reasonable to me, but I'm not terribly familiar with the release process nor any opinions you might have about the tools in-use

[carltongibson]

@bigfootjon Yes, thanks. I have a few thoughts before merging this.

(I need to think them through fully yet 😅)

[carltongibson]

OK, I had a closer look.

TBH I'd rather scope this down to just the smaller project data move, and the pyupgrade shift, leaving the tool configuration where it is.

We could have a .flake8 and move the pytest etc maybe, but I want to keep the tox config where it is.

[carltongibson]

I'm not seeing the value of the changes to this file.

e.g. this adds nothing:

# Tox
/.tox

[asears]

Generally I would lean towards commenting the gitignores so if and when you switch tooling you can update.

Github's template provides this example comment for tox though I don't think that's quite accurate.

# Unit test / coverage reports
https://github.com/github/gitignore/blob/main/Python.gitignore

I'll remove them though, feel free to edit the PR.

[carltongibson]

@asears This is looking good thanks. I just need a moment to pull it locally and I will bring it in. Nice one. 🎁