rio-viz equivalent of Raster tileset edition for on-the-fly hillshade/colormap interpretation/indices like ndvi computation

[jo-chemla]

Could be useful to integrate one of:

• titiler /cog/viewer or /cog/map endpoints for user-controllable raster transform. Might as well be just a link to the editors, or a cog icon next to any custom source to edit some params with the corresponding TMS/WMS url GDAL_WMS xml. See discussion for example controls on DSM hillshade. See also titiler user-guide on algorithms
• or links to rio-viz if a public endpoint exists. Also useful for DxMs: rio-tiler-mvt