Support additional required metainformation for ClinVar uploads

[xiamaz]

Is your feature request related to a problem? Please describe.
Currently clinvar uploads require users to provide additional metainformation for reported variants

Describe the solution you'd like
Currently users need to manually add associated OMIM or OPRHA Disease and inheritance. These are not linked to a reported variant but to a case instead.

Describe alternatives you've considered
Currently this is done by users either in our baserow instance or by supplying specifically formatted case comments.

[holtgrewe]

Postponing.