Add ignore_fields_for_comparison() context manager

[yunzheng]

It behaves the same as set_ignored_fields_for_comparison() but only for the duration of the context manager.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.51%. Comparing base (256733d) to head (19566d2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   80.41%   80.51%   +0.09%     
==========================================
  Files          34       34              
  Lines        3171     3182      +11     
==========================================
+ Hits         2550     2562      +12     
+ Misses        621      620       -1     

Flag	Coverage Δ
unittests	80.51% <100.00%> (+0.09%)	⬆️

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