Support Gremlin multi-label vertexes

[michaelnchin]

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Is your feature request related to a problem? Please describe.

Per their docs, Neptune supports use of multiple labels for a single vertex in Gremlin data, via the :: syntax.

The Gremlin graph visualizer does not currently recognize or provide any special processing for multi-labels included in query results.

Describe the solution you'd like

The Gremlin visualizer options --display-property and --group-by-property should be able to factor in multi-label vertexes when matching on a single label value.

For example, if a %%gremlin query returns the multi-label vertex:

{<T.id: 1>: '0', <T.label: 4>: 'Label1::Label2::Label3', 'name': 'a_vertex'}

Users should be able to pass the following to --display-property:

my_node_labels = ‘{“Label1”:“name”}’`

And get "a_vertex" as the displayed value on the same vertex in the visualized graph.