feat(eval): Distinguish JSON rules from sidecar rules

[effigies]

We currently duplicate a lot of sidecar errors for both the data file and the sidecar. This PR skips sidecar checks for sidecar files, avoids loading sidecar data for JSON files, and creates separate issue codes for missing keys in standalone JSON files (dataset_description.json, *_coordsystem.json, etc.) vs sidecar files.

[codecov]

Codecov Report

Attention: Patch coverage is 82.85714% with 6 lines in your changes missing coverage. Please review.

Project coverage is 87.09%. Comparing base (796133c) to head (4fa9c76).

Files	Patch %	Lines
bids-validator/src/schema/applyRules.ts	72.72%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2031      +/-   ##
==========================================
+ Coverage   85.75%   87.09%   +1.33%     
==========================================
  Files          91      136      +45     
  Lines        3785     6449    +2664     
  Branches     1218     1550     +332     
==========================================
+ Hits         3246     5617    +2371     
- Misses        453      742     +289     
- Partials       86       90       +4     

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[effigies]

This needs bids-standard/bids-specification#1878. Not filling in context.sidecar for JSON files helped catch some checks that were triggered on sidecar files as well as their data files.