feat: Add values to associations.bvals, fix misnamed variables

[effigies]

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Allows https://github.com/bids-standard/bids-specification/pull/1754 to be validated.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 86.99%. Comparing base (43a7117) to head (173ecc2).

Files	Patch %	Lines
bids-validator/src/schema/associations.ts	42.85%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1955      +/-   ##
==========================================
+ Coverage   85.68%   86.99%   +1.31%     
==========================================
  Files          91      130      +39     
  Lines        3792     6181    +2389     
  Branches     1220     1501     +281     
==========================================
+ Hits         3249     5377    +2128     
- Misses        457      713     +256     
- Partials       86       91       +5     

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