code: public DataLoaderRegistry combine(DataLoaderRegistry registry) {
          DataLoaderRegistry combined = new DataLoaderRegistry();
  
          this.dataLoaders.forEach(combined::register);
          registry.dataLoaders.forEach(combined::register);
          return combined;
      }
docs: This will combine all the current data loaders in this registry and all the data loaders from the specified registry
  and return a new combined registry
  
  @param registry the registry to combine into this registry
  
  @return a new combined registry