Add linting and formatting pre-commit/CI checks

[bpkroth]

This is more a convenience to developers and reviewers.

Often changes include some tweaks from an IDE's opinion on reformatting that reviewers have to adjust or ask for revisions on.

We can (should) automate this with pre-commit hooks and CI checks to remove a burden on both developers and reviewers.

Introducing these changes however will likely reformat a large portion of the codebase, so should be kept to a separate PR.