Static checks aren't defined in configs

[max-sixty]

Describe the bug

Ref #2908 (comment) & #2908 (comment)

Currently running mypy . & flake8 . returns enough errors to overflow my terminal. It sounds like that's because the ignores & excludes are defined in the tox file, rather than in python config files, like setup.cfg / pyproject.toml / etc.

The tox file isn't picked up by editors, or by anyone running these tools in the standard way.

[jtcohen6]

Good points @max-sixty. We use tox as the basis for all our testing via via make, CI, and dev shorthand (scripts/dtr.py).

That said, I'm in favor of moving these configs down a level so that folks who run mypy or flake8 directly will see the same errors.

[github-actions]

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