Check/test full support for raster coordinates

[ianthomas23]

xarrays can have no (x, y) coordinates, or they can have 1d or 2d coordinates. Need to check that all algorithms support all 3 use cases, and add tests for them all.

New GPU algorithms certainly don't support this yet.

[thuydotm]

In the GIS world, I think it makes sense to assume that the data array should contain at least 2 dimensions of (y, x), or (lat, lon) coords. In fact, some of the xarray-spatial algorithms do not take coordinate values into account (zonal tools, multispectral tools for example), but if one does, then the coords should be named correctly IMO.

[ianthomas23]

Following discussion, we will restrict this to (y, x) coordinates that are each 1d arrays initially.