Move to pyproject.toml

[willGraham01]

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Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
Remove some of our outdated config files and use pyproject.toml standard instead.

What does this PR do?

• Moves all package metadata and installation information into pyproject.toml instead of splitting it between setup.cfg and tox.ini, etc.
• Updates the CI to be consistent with our other packages.
• Updates the pre-commit config and other linting files and settings.
• Fixes a bug where the "Example QWidget" option after installing would throw an error - a command was missing from the napari.yaml file.

References

How has this PR been tested?

Local pip install -e . behaves identically to main. (Note that the widget on main remains broken, but it has the same error.)

Is this a breaking change?

Does this PR require an update to the documentation?

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

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[alessandrofelder]

I guess at some point we'd want this repo to be more consistent with napari testing setup than the brainglobe testing setup (given that this might become a napari thing one day)? But this will do for our development ease, for now.