modify mydisease.info / disgenet to account for score

[andrewsu]

In NCATSTranslator/Feedback#479, BTE is retrieving a low-scoring gene-disease edge from disgenet via mydisease.info. I propose that we add a score threshold for disgenet to BTE. I think that involves allowing filters on this field in mydisease (e.g., https://mydisease.info/v1/disease/MONDO:0020333?filter:disgenet.genes_related_to_disease.score:>0.5) and then modifying the mydisease.info smartAPI annotation to take advantage of that filtering capability. Based on my cursory view, a threshold of 0.5 seems like a good starting point.