Integration of parts of the PoC of magnet:

1. assessing the PoC in order to extract the main components; Evaluate whether the changes break the API.
2. integrate Vector class; (on hold - depending on the dependency status of declearn)
3. integrate Optimizer class for nodes;
4. integrate Optimizer for researcher and add Optimizer-specific communications;
5. Keep training plans
6. integrate Model (not now, but later on). Make it generalizable for other non gradient based model / optimizers