Test for more Python versions

[martin-majlis]

This PR:

• Adds tests for Pypy3.9 and Pypy3.10
• Divides code quality check into multiple jobs

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.49%. Comparing base (2cd6699) to head (26470b4).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files           1        1           
  Lines         415      415           
=======================================
  Hits          388      388           
  Misses         27       27           

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