This function combines an ecoregion map and a land cover map (e.g. ecodistricts and LCC)
and creates a map and table of containing their combined values and pixel IDs.
Used internally in LandR modules to prepare maps for to make cohortData.
ecoregionProducer(ecoregionMaps, ecoregionName = NULL, rasterToMatch)a list with two rasters, one with ecoregions (e.g. ecodistricts)
and another with land cover (e.g. LCC).
the name describing the type of ecoregions in first map
(e.g. "ecoDistrict") if passing a polygon file.
A RasterLayer objects to use as the template for all subsequent
raster operations (i.e., the one used throughout the simulation).
A list with two objects: the ecoregionMap and a table summarizing
its information per pixelID