feat(Scripts): support multi-level script groups via subfolders

[fubuloubu]

What I did

Refactored the discovery of ape scripts to make them slightly "lazier" and adding support for "subfolder groups", which composes a click.Group from script files (and/or further subfolder groups) for a non-module path

fixes: #2735

Also tried to fix this issue w/ using --interactive where a successful script doesn't actually launch the terminal

fixes: #2693

How I did it

By refactoring the discovery process, we add a lot more flexibility on how we handle the scripts/ folder, allowing the potential for other types of scripts (remote or dependency scripts, non-Python scripts, etc.)

Also, in theory it should now support loading scripts from a Python module, as long as that module exposes either a main function or cli click.Command|Group

How to verify it

Run this branch on any Ape project and see if it works

Checklist

• All changes are completed
• Change is covered in tests
• Documentation is complete