Feat/custom authentification

[jacquesfize]

In PnX-SI/GeoNature#2976, we propose to enable the customization of the login process to use custom login providers (CAS for instance). This PR includes the required changes of UsersHub-authentification-module to make it work.

[codecov]

Codecov Report

Attention: Patch coverage is 67.85714% with 27 lines in your changes missing coverage. Please review.

Project coverage is 52.84%. Comparing base (975a3eb) to head (e4c22a8).
Report is 10 commits behind head on develop.

❗ Current head e4c22a8 differs from pull request most recent head 4a0144a

Please upload reports for the commit 4a0144a to get more accurate results.

Files	Patch %	Lines
src/pypnusershub/authentification.py	69.38%	15 Missing ⚠️
src/pypnusershub/routes.py	65.71%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #93      +/-   ##
===========================================
+ Coverage    51.79%   52.84%   +1.05%     
===========================================
  Files           14       15       +1     
  Lines          726      774      +48     
===========================================
+ Hits           376      409      +33     
- Misses         350      365      +15     

Flag	Coverage Δ
pytest	52.84% <67.85%> (+1.05%)	⬆️

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