Add ability to filter variants by clinvar confidence score for disease variant associations

[kshefchek]

For example by setting a minimum confidence threshold, eg setting 2 for marfans would generate the solr query:

https://solr.monarchinitiative.org/solr/golr/select/?wt=json&rows=10&q=*:*&fq=object_closure:%22MONDO:0007947%22&fq=confidence_score:[2%20TO%20*]