Allow specifying server vs client mode when creating a challenge.

[ChadSikorra]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.85%. Comparing base (cffd4fd) to head (17fded2).
⚠️ Report is 1 commits behind head on master.

❌ Your project status has failed because the head coverage (78.85%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master       #6      +/-   ##
============================================
+ Coverage     78.80%   78.85%   +0.04%     
  Complexity      428      428              
============================================
  Files            25       25              
  Lines          1293     1296       +3     
============================================
+ Hits           1019     1022       +3     
  Misses          274      274              

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