Encode the coverage function or better the GridFunction as per clause 19.3.12 of GML
3.2.1 which helps us with indicating in which way we traverse the data.
Notice that we use the axisOrder to actually always encode data il
easting,northing, hence in case of a northing,easting crs we use a reversed order to
indicate that we always walk on the raster columns first.
In cases where the coordinates increases in the opposite order ho our walk the
offsetVectors of the RectifiedGrid will do the rest.