Refactor smartrelashionshipsmixin

[TheoLechemia]

Exclusion par défaut (via only) des fields de type RelatedList et Related utilisé par marshmallow_sqlalchemy lorsqu'on utilise la propriété include_relationships=True ou qu'on charge le champs via auto_field

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0197e64) 81.51% compared to head (12f18fd) 81.58%.

❗ Current head 12f18fd differs from pull request most recent head a665b50. Consider uploading reports for the commit a665b50 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #47      +/-   ##
===========================================
+ Coverage    81.51%   81.58%   +0.07%     
===========================================
  Files            3        3              
  Lines          238      239       +1     
===========================================
+ Hits           194      195       +1     
  Misses          44       44              

Flag	Coverage Δ
pytest	81.58% <100.00%> (+0.07%)	⬆️

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