Discuss whether we should maintain 'line-length = 99'

[tigarmo]

This goes against Starbase's default, but the reformatting is possibly quite noisy (git-black-wise). We could go either way, so we should discuss and make a decision.

[lengau]

cc @syu-w

It's probably worth discussing the starbase value too. It's currently at 88 because that's the default in tools like black and because it inherited those numbers from charmcraft (which seems to have used those numbers because they were the default).

[syu-w]

I did a quick scan and charmcraft had around 800 lines code exceed 88 line length.
find . -iname "*.py" -exec cat {} \; | awk '{print length}' | sort -g | uniq -c

I am ok with 88, 99, or 100. Maybe we should see if our display can easily show them in one screen.