(🎁) make basedtyping work when using basedmypy #551
Description
It doesn't work because mypy is invoked with --no-site-packages, which makes basedtyping unavailable.
Maybe we could modify mypy_path or move/copy the package somewhere so that basedmypy will find it.
The reason mypy_extensions works is because it is hardcoded in mypy/typeshed, and I have no intention of doing the same with basedtyping.