Added RasterSource/GDALBand GDAL objects

Based on Daniel Wiesmann's raster branch. Refs #23804.
The projection of this raster is `3086`, somehow the `WKT` version of the GDAL info does not have the number in it explicitly. I can update the raster such that the srs gets the correct srid from it (in my experience, from the WKT version is not always very clear what srid it really is).