feat(discovery): support "one or more of"-type queries

[davidlougheed]

very WIP...

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.11%. Comparing base (7925982) to head (9d397e0).

Files with missing lines	Patch %	Lines
chord_metadata_service/discovery/fields.py	60.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #616      +/-   ##
===========================================
- Coverage    94.18%   94.11%   -0.07%     
===========================================
  Files          135      135              
  Lines         5279     5289      +10     
  Branches       496      498       +2     
===========================================
+ Hits          4972     4978       +6     
- Misses         214      217       +3     
- Partials        93       94       +1     

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