pkg_resources is deprecated #36
Description
we should use importlib instead see https://setuptools.pypa.io/en/latest/pkg_resources.html
build failed with CI it cannot find pkg_resources
I implemented a module oa_pkg_resources on branch pkg_sources that replaces (mimic) pkg_sources function in core. This passed the tests in core, however it did not pass test from setuptools test_find_distribution. It would necessitate to rewrite the complete library. So I stop there and did not make a pull request.