Add component `from_dict` and `to_dict` methods

[silvanocerza]

Add from_dict and to_dict to Component interface.

All classes decorated with @components will have a default implementation added.

Given a MyComponent class that accepts a value parameter in __init__ to_dict() will create a dictionary similar to this:

{
        "hash": <id_of_the_instance>,
        "type": "MyComponent",
        "init_parameters": { "value": 100 },
 }

MyComponent.from_dict() will instead return a new instance of MyComponent given the above dictionary.

Trying to call OtherComponent.from_dict() using the above dictionary will fail.