@Override
    public void registerForwardCallbackRaw(String channelName, Predicate<byte[]> callback) {
        ForwardCustomCallback customCallback = new ForwardCustomCallback(channelName, callback);
        registerCallback(customCallback);
    }
Sends (or queues the sending of) the message encapsulated by the given message agent

@param agent the agent
helper/src/main/java/me/lucko/helper/messaging/bungee/BungeeCordImpl.java