Biocommon HGVS validation of edit / ranges

We are affected by [this HGVS bug](https://github.com/biocommons/hgvs/issues/279) ie we can import the following as classification HGVS:

NM_001637.3:c.1582_1583G>A

And because we replace outside references with our references, this has HgvsMatchRefAllele.calculated_ref = 'CC'

So it is imported as:

NM_001637.3(AOAH):c.1582_1583delGGinsA

Expected result: Fails validation

I think we should patch VG code in "Switch reference base" section (line 236) of hgvs_converter_biocommons as well as submit a patch to biocommons HGVS