Switch from entrypoints to importlib.metadata

[s-t-e-v-e-n-k]

Since the minimum Python version supported now directly supports querying entry points using the standard library, write a wrapper around to support both upstream APIs, and make use of it, rather than the external entrypoints package.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (cb2eb37) to head (30394a4).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #792      +/-   ##
==========================================
- Coverage   91.54%   91.32%   -0.23%     
==========================================
  Files          17       17              
  Lines        1621     1636      +15     
==========================================
+ Hits         1484     1494      +10     
- Misses        137      142       +5     

[MSeal]

The one build failure looks unrelated result of merging master in. I'll take a look later at it to resolve if you don't get it before me. Thanks for posting the improvement!

[s-t-e-v-e-n-k]

@Borda I've corrected the docstring you've pointed out (sorry it took me so long!)

[Borda]

This looks strange to be included, is it testing artifact?

[s-t-e-v-e-n-k]

Yes, it's a testing file -- we provide just enough wheel metadata in that path to give us one entry point.