Write functions for forward and reverse transcription and translation between alleles

[jsstevenson]

Feature description

Really just see here: biocommons/anyvar#146

Use case

Use in AnyVar and MetaKB for catvar searches (see here cancervariants/metakb#721)

Acceptance Criteria

Uhhh this is still imprecise I guess. but I think we probably want functions that individually do transcription and translation, and then a big method that enumerates all of the different members.

Proposed solution

No response

Potential Impact

No response