Add the ruff linter

[jherland]

A minimal introduction of ruff. The first in a series of 3 PRs.

Commits:

• Mypy: Disallow blanket type: ignore
• pyproject.toml: Add ruff as a lint dependency
• Add minimal ruff configuration
• noxfile.py: Add ruff check . to lint target

[jherland]

Is this a poetry-focused usage of pyproject.toml which disallows that?

Exactly. Since we're using Poetry, we're currently defining our project metadata in the Poetry-specific [tool.poetry] section in our pyproject.toml.

[project]
requires-python = ">=3.8"

This is from the PEP621 standard for specifying project metadata, and this standard seems to have more momentum than Poetry's own format, so I'd like to migrate to this at some point. Either we see if Poetry can support the more standard format, or we look around for alternatives to Poetry. But that is a separate issue/effort than this PR. 😄

[jherland]

Either we see if Poetry can support the more standard format, or we look around for alternatives to Poetry. But that is a separate issue/effort than this PR.

Created https://github.com/tweag/FawltyDeps/issues/433 to keep discussing our future with/without Poetry