Type check collection.py (PP-503)

[jonathangreen]

Description

Add type checking information to collection.py before refactoring.

Motivation and Context

First step for PP-503.

How Has This Been Tested?

Running tests locally and in CI.

Checklist

• I have updated the documentation accordingly.
• All new and existing tests passed.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (cafb589) 90.39% compared to head (c7a5154) 90.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1481      +/-   ##
==========================================
- Coverage   90.39%   90.37%   -0.02%     
==========================================
  Files         231      231              
  Lines       29577    29596      +19     
  Branches     6894     6908      +14     
==========================================
+ Hits        26735    26747      +12     
- Misses       1814     1816       +2     
- Partials     1028     1033       +5     

Flag	Coverage Δ
Api	73.52% <70.21%> (+0.01%)	⬆️
Core	61.03% <87.23%> (-0.01%)	⬇️
migration	28.48% <47.87%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
core/model/classification.py	79.37% <100.00%> (ø)
core/model/contributor.py	92.27% <100.00%> (ø)
core/model/hassessioncache.py	100.00% <100.00%> (ø)
core/model/integration.py	95.91% <100.00%> (+0.17%)	⬆️
core/opds_import.py	89.61% <100.00%> (ø)
core/model/library.py	96.66% <66.66%> (-0.47%)	⬇️
core/model/collection.py	94.01% <89.61%> (-1.83%)	⬇️

... and 2 files with indirect coverage changes

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[RishiDiwanTT]

Looks good 👍