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
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 https://github.com/OSGeo/PROJ/issues/2194