Move dependencies to pyproject.toml and eliminate setup.py

[bmos]

What is this change?

• Create parsons[all] via self-referencing extras. See here, here, and here (poorly documented).

Considerations for discussion

• Ability to self-reference extras was added in pip 21.2, so older pip versions are not supported. As python 3.10 is our oldest supported python version and was released in Oct 2021, our users shouldn't be on versions older than that.

How to test the changes (if needed)

• CI tests should be adequate.

Breaking Changes

Breaking changes are changes to our public API which may require existing users to change their code. If there are no breaking changes, any existing parsons user should not need to do anything after updating their parsons version.

Does this PR introduce breaking changes?

• label: Breaking change — This PR introduces one or more breaking changes.
• label: Non-breaking change — This PR does not introduce one or more breaking changes.

Details (if needed)

• (List out any changes to the API that may cause breaks for developer implementation.)

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.