Add the possibility to store the robot name inside the telemetry

[GiulioRomualdi]

It would be nice to add a string containing the name of the robot.
The idea is to add it at the same level of description_list a possible name could be robot_name.

What do you think @Nicogene @S-Dafarra @traversaro @AlexAntn

[Nicogene]

I think it can be added without problems!

[S-Dafarra]

I think it is ok to add it. Do you envision cases where different signals have different robot_names?

On a more abstract level, I think this issue is a close relative to #156

In general, I think that these issues could be solved in the long-term by adding some sort of custom configuration struct (like in #154)

[traversaro]

Probably we can be explicit and call it yarp_robot_name ? Just to avoid problems if in the future we want to encode other robot-related information (such as directly URI of the URDF model using the ROS-URI package://iCub/robots/iCubGenova09/model.urdf, see robotology/icub-models#90) and we may get confused.

[GiulioRomualdi]

I will go for yarp_robot_name!

[GiulioRomualdi]

I think it is ok to add it. Do you envision cases where different signals have different robot_names?

For the time being, I would just add a string that should contain the yarp_robot_name of the machine where the yarp_telemetry is used.
Then I agree we should add a struct containing several info. i.e. the robot name, the text logs (the one displayed in YarpLog for each IP)