[SCHEMA] add schema check to test for consistency between PET imaging dat…

[mnoergaard]

…a and metadata

This PR closes issue #1897 as discussed here https://github.com/bids-standard/bids-validator/issues/2097

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.10%. Comparing base (7b0f76d) to head (0278bac).
Report is 263 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1898   +/-   ##
=======================================
  Coverage   88.10%   88.10%           
=======================================
  Files          16       16           
  Lines        1396     1396           
=======================================
  Hits         1230     1230           
  Misses        166      166           

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