Speed up imports by using importlib instead of pkg_resources
Speed up imports by up to a second by replacing uses of pkg_resources
with the new Python standard library module importlib.resources (or,
for Python < 3.7, the backport importlib_resources). The old
pkg_resources module is known to be slow because it does a lot of
work on startup.
See, for example, pypa/setuptools#926 and pypa/setuptools#510.
Edited by Leo P. Singer