Add pre-commit utilities

[vwxyzjn]

This PR introduces pre-commit pipelines, which include

• black: auto-format
• codespell: check word spelling
• mypy

going to add the following hooks in a follow-up PR:

• isort: automatically sort imported dependencies
• autoflake: automatically remove unused variables and unused imports

However, it does keep the tests alone because they run slow: see https://github.com/pre-commit/pre-commit-hooks/issues/291

[vwxyzjn]

Hey, @cswinter could you remove the black and mypy as the required CIs?

[vwxyzjn]

Merging this now.