Use the modern importlib.metadata

[mwcraig]

importlib.metadata was introduced in python 3.8 according to the documentation. The previous importlib_metadata is a backport of new importlib features to earlier python versions. pkg_resources has been deprecated for a long time and may be gone from setuptools now.

The alternative, I suppose, is to declare importlib_metadata as a dependency.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.14%. Comparing base (c840f96) to head (ac95efd). Report is 98 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #434 +/- ## ======================================= Coverage 80.14% 80.14% ======================================= Files 30 30 Lines 3913 3913 ======================================= Hits 3136 3136 Misses 777 777 ```

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