Handling of `ModuleImporter`

[LecrisUT]

Trying to get an understanding with @happz on the issues in https://github.com/teemtee/tmt/issues/2922#issuecomment-2376776356

The main issue is that not all IDEs handle the ModuleType well, PyCharm for example fails to auto-complete, while the type-checkers seem to need special workarounds. I've tried out an alternative design in: https://github.com/LecrisUT/optional_imports

But the more I think about it, what are the purpose of using ModuleImporter over just try import in each relevant module?