This PR migrates the custom_data_interp_comp.glsl to use shader create info. During development tests have been conducted to use specialization constants, but due to limitations inside Metal we didn't use them. Number of ShaderCreateInfos have been reduced by using macros. Variadic macros have not been used as they don't support CPP compilation. Pull Request: https://projects.blender.org/blender/blender/pulls/134932