support for default notification rules

[bouttier]

Rules with NULL id_role are used if there are no rules for current user.

[codecov]

Codecov Report

Base: 67.83% // Head: 67.83% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (023d6e4) compared to base (60ae414).
Patch coverage: 96.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2267   +/-   ##
========================================
  Coverage    67.83%   67.83%           
========================================
  Files           84       84           
  Lines         7369     7366    -3     
========================================
- Hits          4999     4997    -2     
+ Misses        2370     2369    -1     

Flag	Coverage Δ
pytest	67.83% <96.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
backend/geonature/core/notifications/routes.py	97.40% <91.66%> (+0.69%)	⬆️
backend/geonature/core/notifications/models.py	88.60% <100.00%> (+1.65%)	⬆️
backend/geonature/core/notifications/utils.py	90.69% <100.00%> (+0.22%)	⬆️

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