project: Add a minimum supported version

[Javagedes]

Adds the concept of a minimum supported version (MSV) to the project. The project will continue to always maintain and support N-2 versions of Python, however the MSV will be the oldest version of python that can run the project (i.e. the project does not use any features that are newer than the MSV). This value is subject to change at any time due to the needs of the project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.65%. Comparing base (bf643b0) to head (55fb4e8).
Report is 133 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
+ Coverage   78.75%   79.65%   +0.89%     
==========================================
  Files          49       41       -8     
  Lines        4909     5072     +163     
==========================================
+ Hits         3866     4040     +174     
+ Misses       1043     1032      -11     

see 49 files with indirect coverage changes

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