Support repeats in genotypes when generating VCF-style variant identifiers

[apriltuesday]

For example (CA)16/(CA)17 (rs11568315 in clinical annotation 981475986). Evidence containing these genotypes is generated, but without genotype IDs, consequences or target genes.

Tasks:

• Confirm that the format is consistent (check logs for past runs)
• Decide what identifier to use for these
• Implement consequence prediction, integrating logic from CMAT's repeat expansion pipeline as needed