Address stop codon recoding / stop codon readthrough (SCR)

[holtgrewe]

Is your feature request related to a problem? Please describe. We currently do not properly handle SCR, e.g., in SELENON.

Describe the solution you'd like Address this issue.

Describe alternatives you've considered N/A

Additional context

• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6344875/
• https://github.com/SACGF/cdot/issues/66
• https://github.com/biocommons/hgvs/issues/710

[holtgrewe]

We already have the proper selenoprotein translation table:

https://github.com/bihealth/hgvs-rs/blob/b025ff27436af6228c8156d0f8007bdf1dde1032/src/sequences.rs#L1124

[holtgrewe]

We really need to double-check whether our selenoprotein support is sufficient.