feat: Validate CITATION.cff

[rwblair]

Dataset level check to validate citation.cff. Imports citation.cff json schema from @bids/schema package, convert citation.cff to json, and call ajv on it with stock ajv-formats.

Closes #1959.

[codecov]

Codecov Report

Attention: Patch coverage is 85.41667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 87.58%. Comparing base (e0ada04) to head (0c1b20a).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
bids-validator/src/validators/citation.ts	78.12%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2116      +/-   ##
==========================================
+ Coverage   85.72%   87.58%   +1.86%     
==========================================
  Files          91      134      +43     
  Lines        3782     7017    +3235     
  Branches     1220     1660     +440     
==========================================
+ Hits         3242     6146    +2904     
- Misses        454      776     +322     
- Partials       86       95       +9     

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[effigies]

LGTM. CI failures should be resolved in #2117.