Generate library

[benoit74]

This is WIP, following latest discussions many things have to be adapted, but I still merge this since it is in a "working state".

[codecov]

Codecov Report

❌ Patch coverage is 92.63158% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.21%. Comparing base (c7ce5e4) to head (4c0dcdf).
⚠️ Report is 3 commits behind head on cms-upgrade.

Files with missing lines	Patch %	Lines
backend/src/cms_backend/api/routes/library.py	87.93%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           cms-upgrade     #131      +/-   ##
===============================================
+ Coverage        80.23%   81.21%   +0.97%     
===============================================
  Files               34       36       +2     
  Lines             1108     1203      +95     
  Branches            95      104       +9     
===============================================
+ Hits               889      977      +88     
- Misses             198      202       +4     
- Partials            21       24       +3     

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