Update CADD VEP annotations to support insertions/deletions (indels)

[frewmack]

https://useast.ensembl.org/info/docs/tools/vep/index.html

• https://rest.ensembl.org/documentation/info/vep_region_get possible option
• Include a pre-built link to this for each row in table
• Note that it expects hg38, so liftover is required