Investigate support for icons and colors in metadata blocks

[cmbz]

Users may want metadata blocks that support icons and colors, not just text. The Trusted Data use cases are likely to need this functionality.

The purpose of this issue is to investigate possible designs for this feature.

[pdurbin]

We already support images here for example: https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/YKAMUT

            "distributorLogoURL": {
              "typeName": "distributorLogoURL",
              "multiple": false,
              "typeClass": "primitive",
              "value": "https://dataverse.harvard.edu/logos/10/mra_logo.jpg"
            }