✨ [#142] make exception field camelization configurable via setting

[OlhaZahoruiko]

Closes #142

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.79%. Comparing base (7f350c4) to head (068235e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   66.66%   66.79%   +0.12%     
==========================================
  Files          89       90       +1     
  Lines        3417     3430      +13     
  Branches      383      385       +2     
==========================================
+ Hits         2278     2291      +13     
  Misses       1044     1044              
  Partials       95       95              

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[stevenbal]

@OlhaZahoruiko I slightly changed the settings to group them under the namespace COMMONGROUND_API_COMMON, most modern 3rd party django apps do this to make it a bit more organised.