Add qualifiers

[tokebe]

(Using new QEdge refactor) add support for qualifiers in queries, update tests.

Related PRs:

• Add qualifiers api-respone-transform.js#41
• Add qualifiers biothings_explorer#535
• Add qualifiers bte_trapi_query_graph_handler#129
• Add qualifiers smartapi-kg.js#63
• Add qualifiers biolink-model.js#32

[codecov]

Codecov Report

Merging #63 (bfb2ab4) into main (219a2d4) will decrease coverage by 0.07%.
The diff coverage is 68.57%.

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
- Coverage   77.15%   77.08%   -0.08%     
==========================================
  Files          10       10              
  Lines         429      432       +3     
==========================================
+ Hits          331      333       +2     
- Misses         98       99       +1     

Impacted Files	Coverage Δ
src/builder/trapi_query_builder.js	72.50% <68.57%> (-0.48%)	⬇️

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[colleenXu]

Addresses biothings/biothings_explorer#512 and biothings/biothings_explorer#514