Add frequency bands to the Histopheno chart

[monicacecilia]

We (@kevinschaper) are considering the display of these frequencies following a "vintage" suggestion (see screenshot).
SOLR is already turning things into numbers. Perhaps we can make use of it to generate numerical banding; our chart could split each bar by frequency.

ORPHA offers frequency using qualifiers.
OMIM offers it using numbers.

In the Monarch app, we provide results from both sources (HPO has two different pages for the same disease, depending on the source of the association). We want to continue showing both on one page.