@Override
    public void registerConnectEventListener(final ReplicatorGroup replicatorGroup) {
        this.replicatorGroup = replicatorGroup;
    }
GRPC RPC client implement.

@author nicholas.jxf
@author jiachun.fjc
jraft-extension/rpc-grpc-impl/src/main/java/com/alipay/sofa/jraft/rpc/impl/GrpcClient.java