Support color & metadata in geoJSON outputs

[jmlord]

Is your feature request related to a problem? Please describe.
There is no visual way to differentiate point in the rendered geoJSON.
It's not possible to see the metadata attached to the points in the rendered geoJSON, like for the CSVs where clicking on a point shows the rest of the metadata from the CSV in a popup.

Describe the solution you'd like
A spec to write the color and additional metadata directly in the geoJSON file.

Describe alternatives you've considered
Generating an HTML file from R with an interactive leaflet map, but that would be separate from the BON in a Box viewer.

Additional context
From discussion with @Oselmoni, for the Genes From Space Ne>500 pipeline.

[vicjulrin]

Has this been adjusted from TIFF outputs? For example, if I have a raster with predefined colors that renders correctly in GIS software but doesn't render properly in Leaflet within BON in a Box, is it possible for Leaflet to directly render the defined color palette? Or does it need to be done from the YML file?

[jmlord]

This issue is specifically for GeoJSON, For TIFF, please refer to this issue: #89