Add NADCON5 grids #89
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Add all NADCON5 grids referenced by EPSG, converted from their source at https://geodesy.noaa.gov/pub/nadcon5/20160901release/Builds using the included build_nadcon5.py script, which leverages the GDAL 3.7dev [NOAA_B driver](https://gdal.org/drivers/raster/noaa_b.html) This introduces 2 new types of grids: - GEOGRAPHIC_3D_OFFSET: when there are 3 components latitude_offset, longitude_offset, ellipsoidal_height_offset. For example used for CONUS grids - ELLIPSOIDAL_HEIGHT_OFFSET when the resolution of the grid with ellipsoidal_height_offset is different from the one with latitude_offset + longitude_offset. For example used for Alaska grids Refs OSGeo/PROJ#2194
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Add all NADCON5 grids referenced by EPSG, converted from their source at https://geodesy.noaa.gov/pub/nadcon5/20160901release/Builds using the included build_nadcon5.py script, which leverages the GDAL 3.7dev NOAA_B driver
This introduces 2 new types of grids:
Refs OSGeo/PROJ#2194