The module pysteps/io/interface.py currently uses pkg_resources.iter_entry_points for entry-point discovery. However, pkg_resources is part of setuptools, which introduces an unnecessary runtime dependency (see errors in the latest conda-forge built: conda-forge/pysteps-feedstock#41

Since pysteps supports python 3.10+, we can modernize the code by replacing pkg_resources with the importlib.metadata module, which is part of the Python standard library.