Prevent module creation pyright type errors

[NeilGirdhar]

Creating any Haiku module gives type errors on the latest Pyright due to the module metaclass specification (https://github.com/microsoft/pyright/discussions/5561). The issue is that the ideal type annotation is an intersection of type[T] and ModuleMetaclass where T is the return type, but Python doesn't have type intersections yet. The authors of the code chose type[T], but Pyright requires ModuleMetaclass.

[NeilGirdhar]

Incidentally, I think most if not all of what is done in the metaclass should be moved into Module.__init_subclass__. Metaclasses have significant compatibility issues (you can't inherit from two classes with different metaclasses). It's best to avoid them.

[superbobry]

Thanks, Neil!