[Feature Request] Allow expansion of RDF classes

[mhavey]

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Graph Explorer Version (and Graph Database and Version used if applicable) Any

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm frustrated when [...] None

Describe the solution you'd like A clear and concise description of what you want to happen. Current solution allows user to expand individuals but not classes. Feature request is to allow user to expand a class. For example if :Mike is an instance of class :Person, I can fully expand :Mike, but I cannot expand :Person to look at its neighbors. Some of those neighbors could be interesting to follow in the canvas. For example, if :Person is linked to a SHACL shape or an R2RML mapping, I might want to inspect the shape or mapping.

Additional context Add any other context or screenshots about the feature request here. Describe any alternatives you've considered.

[AndreaNassisi]

@charlesivie, should we use Oink for this?