add helper for loading clans from csv

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.67%. Comparing base (942c180) to head (5128691).
Report is 8 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2110      +/-   ##
==========================================
+ Coverage   59.52%   59.67%   +0.15%     
==========================================
  Files         253      254       +1     
  Lines        5275     5285      +10     
==========================================
+ Hits         3140     3154      +14     
+ Misses       2135     2131       -4     

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