Rework authorizations: get rid of (deprecated) Oso

[lafrech]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 98.95833% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.70%. Comparing base (82eca01) to head (292087c).
⚠️ Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bemserver_core/authorization.py	91.80%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
+ Coverage   95.50%   95.70%   +0.20%     
==========================================
  Files          45       45              
  Lines        2689     2958     +269     
  Branches      264      266       +2     
==========================================
+ Hits         2568     2831     +263     
- Misses         93       97       +4     
- Partials       28       30       +2     

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