@Override
    public int compareTo(RemoteClient o) {
        return address.compareTo(o.getAddress());
    }
Create a gRPC stream observer to sending stream data, one stream observer could send multiple stream data by a
single consume. The max number of concurrency allowed at the same time is 10.

@return stream observer
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/remote/client/GRPCRemoteClient.java