Add support for UnkownGeneElement in translator output

[jarbesfeld]

Feature description

Fusion callers can report genes using "NA" if the exact gene symbol is unknown. We should provide support for this in the translator methods.

Use case

One gene partner is NA. We need a way to model this data

Acceptance Criteria

The UnknownGeneElement is class is utilized in modeling fusion caller output

Proposed solution

No response

Alternatives considered

No response

Implementation details

No response

Potential Impact

No response

Additional context

No response

Contribution

Yes, I can create a PR for this feature.