[Feature]: ESLint flat config support for @redwoodjs/eslint-config about redwood

[ahaywood]

😎 Thanks for filing @JoshuaKGoldberg !! ... I think you've been working with @Tobbe on this already? Anything else you need from us?

[JoshuaKGoldberg]

Awesome, thanks @ahaywood!

Digging into the code, it looks like there are two things we could mean by "flat config support":

• 🍎 @redwoodjs/eslint-config: switching it to use the flat config format
• 🍌 @redwoodjs/eslint-plugin: getting it to export plugin metadata

The 🍎 config would be a lot more work, as it's got a lot of dependencies & listings that'd need to switch. I don't think I'm well-positioned as a first-time external contributor to do that.

But the 🍌 I'd be happy to. It's common for ESLint plugins to also export a "recommended" ruleset - doing that here would be a happy point. So if you don't mind, I just renamed this issue, will file a new one for the plugin, & can work on that now.