Inference on a remote model

[gmuraru]

At the moment of creating this issue, I do not know if we can do this in Syft but it should be pretty easy to implement.
We need to have a way to send data to a server and that server should run the inference (a minimum required) on a pre-trained model (that was trained using FL) and give back the result.

More ideas after we have the basic building block:

• send back the saliency map
• use HE to send to model
• use DP in case the client wants to "attack" the model