Data Table export/import doesn't support map/set properties

DataTableUtils::IsSupportedTableProperty needs updating to include those types, and we should probably also make sure they export in a nice way in the JSON exporter/importer (the CSV one can just use the exported text).

1. Create a data table with a map or set property in it.
2. Export to CSV or JSON.
3. Note that the map or set property wasn't exported.