Add visualizations for Cyber Observables inside an Observed Data instance

[hotgazpacho]

Currently, the UI only detects and renders top level SDOs. Cyber Observables within Observed Data instances are not rendered as graph nodes, nor are their *_refs rendered as edges. Instead, they are rendered as JSON in the properties sidebar. It would be very valuable to be able to render the Cyber Observables and their relationships.

[gtback]

Thanks, @hotgazpacho. I agree this would be a useful feature! In fact, I think the implementation in cti-stix-visualization pre-dates the current method of relationships between Cyber Observables.

Are you able to make this change? I'd be happy to accept a PR that does this, but I don't think the current maintainers will have the time to do this anytime soon. 🙁

[hotgazpacho]

I'm certainly capable of such a change. Let me noodle on it for a bit and see what I can come up with.

[gtback]

Excellent! Thanks, @hotgazpacho .

Just so you know, before we can merge a PR, you'll need to sign the OASIS CLA.