Add more complete coverage of ACMG categories

[julesjacobsen]

These will require additional data, so will fit well with the 14.0.0 data-upgrade theme.

• PS1 - "Same amino acid change as a previously established pathogenic variant regardless of nucleotide change" - Needs AA and position info from ClinVar.
• PM5 - "Novel missense change at an amino acid residue where a different missense change determined to be pathogenic has been seen before" - Needs AA and position info from ClinVar.

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• PP2 - "Missense variant in a gene that has a low rate of benign missense variation and in which missense variants are a common mechanism of disease" - Requires gnomAD gene constraint z-score and ClinVar gene metrics for numbers of missense/nonsense variants in P/LP, B/LB categories
• BP1 - "Missense variant in a gene for which primarily truncating variants are known to cause disease" - ClinVar required

[julesjacobsen]

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7431429/
and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6885382/