Feat: import sites groups

[IdrissaD]

Fixes #574

• ajout d'une colonne id_import à TMonitoringSitesGroups
• ajout des groupes de sites à la logique d'import sur un modèle similaire aux sites et visites
• gestion du fait qu'il peut y avoir des sites sans parent (certains protocoles ont des sites mais pas de groupes de sites)
• écriture des tests, dont :
  • groupes de sites avec sites
  • groupes de sites seuls
  • sites sans groupes de sites
  • sites avec groupes de sites déjà existants
  • réimport du même fichier
  • vérification des altitudes, géométries
  • suppression d'un import

[codecov]

Codecov Report

❌ Patch coverage is 98.65471% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.92%. Comparing base (d148f12) to head (9cd4880).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...le_monitoring/monitoring/import_actions/actions.py	98.57%	1 Missing ⚠️
...nitoring/monitoring/import_actions/site_actions.py	97.14%	1 Missing ⚠️
...g/monitoring/import_actions/sites_group_actions.py	98.82%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #593      +/-   ##
===========================================
+ Coverage    80.72%   81.92%   +1.20%     
===========================================
  Files           46       47       +1     
  Lines         3741     3940     +199     
===========================================
+ Hits          3020     3228     +208     
+ Misses         721      712       -9     

Flag	Coverage Δ
pytest	81.92% <98.65%> (+1.20%)	⬆️

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