Move ISBN lookup to identifier module. (PP-1948)

[tdilauro]

Description

Moves identifier ISBN lookup to the identifier module.

Motivation and Context

[Jira PP-1948]

How Has This Been Tested?

• Tests pass locally.
• CI tests for associated branch pass.

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.09%. Comparing base (c741d34) to head (df8204c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2196   +/-   ##
=======================================
  Coverage   91.09%   91.09%           
=======================================
  Files         363      363           
  Lines       41248    41248           
  Branches     8839     8839           
=======================================
  Hits        37575    37575           
  Misses       2406     2406           
  Partials     1267     1267           

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[jonathangreen]

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