DAL/Node: Extend the CLI

What

Extend the CLI so that:

1. We provide simpler aliases for current profile
2. We provide a new alias operator for producer
3. We branch the random_observer when --observer is given without anything else

Why

Implement the front-end for

The backend part (mainly the amplification for the operator) can be implemented later on (or in a future release).

How

Just change the CLI.