@Override
    public ClientFactory newFactory(ClientFactory httpClientFactory) {
        return new UnaryGrpcClientFactory(httpClientFactory);
    }
{@link ClientFactoryProvider} that creates a {@link UnaryGrpcClientFactory}.
grpc-protocol/src/main/java/com/linecorp/armeria/internal/client/grpc/protocol/UnaryGrpcClientFactoryProvider.java