Order groups in IOCaseApp

[adamnfish]

The docs for option groups explain how to override the help format so that groups are properly ordered.

https://alexarchambault.github.io/case-app/help/#option-groups

Unfortuantely, while case-app also offers an integration for programs using cats-effect (IOCaseApp) this version does not offer the same functionality.

It'd be great if IOCaseApp's xAsked methods offered the same functionality!

This also applies to things like hidden / withFullHelp, and command groups.