structure book issues

[elfkuzco]

Rationale

This PR enhances the issues detailed content by giving them a shape with details filled instead of generating the message on the backend. This allows the frontend to customize the message as they see fit

Changes

• create types for several book issues with underlying models backed by Pydantic
• create types for different issues in frontend
• refactor logic to get different metadata keys to use two methods: get_book_metadata and get_book_title_metadata
• render issues in different ways based on issue type
• refactor logic to show metadata differences to use underlying issue information instead of computing it on frontend

This closes #480
This closes #475

[codecov]

Codecov Report

❌ Patch coverage is 90.81633% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.48%. Comparing base (fff640f) to head (8569905).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/src/cms_backend/db/book.py	87.50%	4 Missing and 1 partial ⚠️
backend/src/cms_backend/schemas/models.py	92.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #507      +/-   ##
==========================================
+ Coverage   81.38%   81.48%   +0.10%     
==========================================
  Files          69       69              
  Lines        4308     4365      +57     
  Branches      509      511       +2     
==========================================
+ Hits         3506     3557      +51     
- Misses        640      645       +5     
- Partials      162      163       +1     

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[benoit74]

LGTM, thank you!