Formatting improvements

[cdce8p]

Noticed these while working on other parts of the codebase. Use pre-commit checks to auto-fix it for the whole codebase

• Remove trailing whitespaces
  https://github.com/pre-commit/pre-commit-hooks?tab=readme-ov-file#trailing-whitespace
• Fix end-of-file
  https://github.com/pre-commit/pre-commit-hooks?tab=readme-ov-file#end-of-file-fixer

Added a basic .pre-commit-config.yaml file to make running them easier. I've stop short of enforcing it to not add an additional required development dependency.

[takluyver]

Thanks, this looks good to me.

(Just in case this is a starting point, I'll say now that I don't generally favour large-scale code cleanups or strict enforcement of style rules. :-)

[cdce8p]

(Just in case this is a starting point, I'll say now that I don't generally favour large-scale code cleanups or strict enforcement of style rules. :-)

That wasn't my plan. I just did this PR as my editor is configured to auto-remove additional whitespaces on save, so while working on all the other PRs I constantly had to make sure to not include unrelated changes. Figured it might be easier to just clean them up in one go.

[takluyver]

Thanks, that makes total sense 👍