WIP: geomesa wcs, refactor encode index cq meta data

This is a WIP progress branch for modifying RasterIndexEntry.scala, the CQ format for the meta data is: ID,geometry (footprint), and time. 
I think we should make dtg optional as in the Vector case. That would actually bring back much of what was removed here. 

I do realize I misspoke: the CQ will be id, geom, and optionally time