Big rework

[benoit74]

Significant rework following latest discussions around the concepts of jail, staging and collections:

• drop the concept of warehouse_path
• drop the concept of library
• add the concept of collection
• add the fact the collection and titles have a mapping table, where we decide under which path a given title is published

[codecov]

Codecov Report

❌ Patch coverage is 84.43396% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.74%. Comparing base (4c0dcdf) to head (3fc946c).
⚠️ Report is 3 commits behind head on cms-upgrade.

Files with missing lines	Patch %	Lines
backend/src/cms_backend/mill/processors/title.py	72.54%	14 Missing ⚠️
backend/src/cms_backend/mill/processors/book.py	77.77%	10 Missing ⚠️
backend/src/cms_backend/db/models.py	90.47%	2 Missing and 2 partials ⚠️
backend/src/cms_backend/api/main.py	60.00%	2 Missing ⚠️
backend/src/cms_backend/db/title.py	33.33%	1 Missing and 1 partial ⚠️
.../cms_backend/mill/process_zimfarm_notifications.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           cms-upgrade     #132      +/-   ##
===============================================
- Coverage        81.21%   78.74%   -2.48%     
===============================================
  Files               36       34       -2     
  Lines             1203     1143      -60     
  Branches           104      100       -4     
===============================================
- Hits               977      900      -77     
- Misses             202      223      +21     
+ Partials            24       20       -4     

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