test(python): Move hypothesis tests into unit test module

[stinodego]

The idea behind this is that parametric tests should be standard operating procedure: you add a new function, write some regular unit tests, write some parametric tests. These tests should be together in the same module. That way, it's easy to see what has already been tested and where coverage might be lacking.

Controlling which tests run is done through markers (e.g. pytest -m hypothesis to run parametric tests).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.99%. Comparing base (3a630ec) to head (40ebe14).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16185   +/-   ##
=======================================
  Coverage   80.99%   80.99%           
=======================================
  Files        1392     1392           
  Lines      178930   178930           
  Branches     2897     2897           
=======================================
+ Hits       144923   144925    +2     
+ Misses      33503    33501    -2     
  Partials      504      504           

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