Information Panel Display Support for Gremlin Cardinality lists

[lauratinnel]

Gremlin allows you to create list properties using "Cardinality". For example (using Python w/ Goblin):

```groups = element.VertexProperty(properties.String, card=Cardinality.list_, default=[])```

You can then add strings to the groups property.

The node/edge information panel on the right hand side of the visualizer displays the first value in the list. There is no way to see all the values in the list. This is a desirable and helpful capability.