Function load_asset_single_from_world 

pub fn load_asset_single_from_world<R>(
    res: ResourcesHolderMut<'_>,
    assets_dir_path: impl AsRef<Path>,
    asset_key: &str,
    f: impl FnOnce(TransSerializerRegistry<'_>, &SerializersResource) -> R,
) -> Option<R>