Better schematic docs

[joamatab]

• start documenting schematic python flow
• add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.77%. Comparing base (7d82acf) to head (662ed80).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2640      +/-   ##
==========================================
+ Coverage   71.71%   71.77%   +0.05%     
==========================================
  Files         366      366              
  Lines       23715    23736      +21     
  Branches     3870     3874       +4     
==========================================
+ Hits        17008    17037      +29     
+ Misses       5583     5574       -9     
- Partials     1124     1125       +1     

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