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Returns the CRS to use for the project when transforming 3D data, or when z/elevation value handling is important. The returned CRS will take into account verticalCrs(), e.g. by returning a compound CRS consisting of crs() + verticalCrs(). This method may still return a 2D CRS, e.g in the case that crs() is a 2D CRS and no verticalCrs() has been set for the project. I.E. It is NOT guaranteed that the returned CRS will actually be a 3D CRS, but rather it is guaranteed that the returned CRS is **ALWAYS** the most appropriate CRS to use when handling 3D data.