In editor Debugger support

[Ughuuu]

This is a big feature, I know godot has some callbacks for this, but it's probably not trivial to add support for it. Making this issue in case you might know the effort and what needs to be done.

[gilzoide]

I think we'd need to implement the _debug_* methods of LuaScriptLanguage, maybe some other ones. I think the best way would be to read Godot code and check how debugging works, then implement the callbacks as they are supposed to. There's little to no docs about this kind of thing. Maybe someone implemented a script language with debugging support that we can check (maybe the Python one?) 🤔

Getting local variables is easy enough, Lua/C has support for this. Member variables is also easy enough, Lua script instances keep a table of properties. Walking up the stack is also easy enough, one can do this today even in GDScript with LuaThread::get_stack_info =]

But certainly, this is not a trivial task.