Fix read custom model id field

[mahenzon]

When specifying custom model id field using model_id_field_name there's an 500 internal server error when getting list of entities.

This PR fixes it using the provided models_storage.get_model_id_field_name

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.63%. Comparing base (1556af3) to head (cc52512).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   91.44%   91.63%   +0.18%     
==========================================
  Files          44       44              
  Lines        2408     2414       +6     
  Branches      279      279              
==========================================
+ Hits         2202     2212      +10     
+ Misses        143      142       -1     
+ Partials       63       60       -3     

Flag	Coverage Δ
unittests	91.63% <100.00%> (+0.18%)	:arrow_up:

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

Files with missing lines	Coverage Δ
fastapi_jsonapi/api/schemas.py	100.00% <100.00%> (ø)
fastapi_jsonapi/data_layers/base.py	93.84% <100.00%> (+0.19%)	:arrow_up:
fastapi_jsonapi/data_layers/sqla/base_model.py	89.79% <100.00%> (ø)
fastapi_jsonapi/data_layers/sqla/orm.py	89.30% <ø> (ø)
fastapi_jsonapi/views/view_base.py	93.08% <100.00%> (+0.03%)	:arrow_up:

... and 2 files with indirect coverage changes

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