Create gene-impact-summary report command

[holtgrewe]

Is your feature request related to a problem? Please describe.
Having the JSONL files is handy as now it will be easy to create a per-gene report of how many variants with each molecular impact and each clinvar pathogenicity are present.

Describe the solution you'd like
Create a clinvar-this data gene-impact-report command for this.

Describe alternatives you've considered
N/A

Additional context

• The aim is to support the upper part of the image here: Collect per-gene information from ClinVar annonars#154