Configure and run automatic Lua code styling

[alerque]

I've looked into this before but the available Lua code formatters have always been sub-par and running them on this project has always run into edge cases that create errors and need manual intervention. Hence I've avoided it.

But the more I use Rust with rustfmt and Python with ruff --format and just don't have to think about code formatting the more I like it. I had another look at Lua and there are now two viable options. The one I'm primarily targeting here is stylua, but there is also an attempt to configure the Lua LSP which runs EmmyLuaCodeStyle to format similarly. For now the canonical style will be what StyLua outputs.

I'm not 100% happy with the output and have some upstream issues opened about fixing it, but the fact that we can already run it out of the box and still get a 100% working project back out of it in very little time means I'll probably be headed this way soon.

I'm not in a hurry to merge this to master, but probably will land it in conjunction with merging develop (#1904) prior to releasing v0.15.0.

The good news for existing PRs and future contributors is that because it works 100%, updating existing PRs to match and avoid merge conflicts is one command away.

[alerque]

I will probably (but not certainly) be holding off on this for this feature upstream. I expect it to get added eventually, and when it does my strong preference for the space will mean a little bit of churn as everything gets reformatted again. It probably shouldn't be a blocker considering how nice it would be to get 100% deterministic formatting, but yes that's why I'm (probably) holding off on this.