docs: private static void addDataEventListenerToPeer(Executor executor, Peer peer, PeerDataEventListener downloadListener) {
          peer.addBlocksDownloadedEventListener(executor, downloadListener);
          peer.addChainDownloadStartedEventListener(executor, downloadListener);
          peer.addGetDataEventListener(executor, downloadListener);
          peer.addPreMessageReceivedEventListener(executor, downloadListener);
      }