Add a "Fix all auto-fixable problems" command

[kanadgupta]

Hi there — my team is exploring a migration from ESLint over to Biome and so far we've been very happy with it! I've been keeping tabs on this project for a while now and it's exciting to see everything y'all have shipped over the last few months 🚀

We are noticing one gap in functionality with this VSCode extension that we often rely on with the ESLint and Stylelint extensions — a "Fix all auto-fixable problems" command:

I noticed #402 was opened on this front and I figured I'd raise this request again because we'd think it'd be a valuable (and hopefully trivial) addition for folks coming from ESLint.

Thanks in advance!

-Kanad

[probablykabari]

I don't know what the roadmap is to know if this is already planned or not, but I'm happy to make a PR. Can someone on the team weigh in?