feat: Pass hedCode as subcode to group errors

[effigies]

cc @happy5214 In case you have any other suggestions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.55%. Comparing base (0a2530b) to head (e118e49).
Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2149      +/-   ##
==========================================
+ Coverage   85.73%   87.55%   +1.82%     
==========================================
  Files          91      133      +42     
  Lines        3785     7008    +3223     
  Branches     1220     1657     +437     
==========================================
+ Hits         3245     6136    +2891     
- Misses        454      777     +323     
- Partials       86       95       +9     

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[happy5214]

Is subcode currently a valid parameter, and will it be added if it isn't?

[effigies]

It is:

https://github.com/bids-standard/bids-validator/blob/f85d51f2b710be07137e6147388ed71461c369f5/bids-validator/src/types/issues.ts#L8-L19

Note this is for the schema validator, which has a new issue format.