Implement personalis variant tests

[reece]

See

• https://docs.google.com/presentation/d/1QEzzH_tkMAIdImKxCRFVI6yifyBWy1IxCe0esnjWo-w/edit#slide=id.p
• https://github.com/personalis/hgvslib
• https://genomemedicine.biomedcentral.com/articles/10.1186/s13073-016-0396-7

The relevant functionality is likely covered already, but it's worth having them explicitly covered using exactly the variants in their test set.

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[github-actions[bot]]

This issue was closed because it has been stalled for 7 days with no activity.

[reece]

This issue was closed by stalebot. It has been reopened to give more time for community review. See biocommons coding guidelines for stale issue and pull request policies. This resurrection is expected to be a one-time event.