@Override
    public <T> GrpcClientBuilder option(ClientOption<T> option, T value) {
        return (GrpcClientBuilder) super.option(option, value);
    }
Returns a newly-created gRPC client which implements the specified {@code clientType}, based on the
properties of this builder.
grpc/src/main/java/com/linecorp/armeria/client/grpc/GrpcClientBuilder.java