Support multi-value properties

## Description
Some database properties are lists of values. These properties should be rendered within Graph Explorer.

- Gremlin currently only shows the first value in the list
- openCypher shows all values in comma separated list
- SPARQL needs to be investigated

## Preferred Solution
- Treat all values as strings
- Concatenate values together with commas separating the values
- Limit list of values to some amount (perhaps 12)
- When there are more values than the maximum, have a "show more" link that will show all the values in a modal that can scroll

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