Update IWear Logger to stream sensor data to yarp ports

[yeshasvitirupachuri]

In view of an example application such as #109, it is a nice feature to have the wearable sensor data streamed through yarp ports. Following the discussion with @prashanthr05 @lrapetti and ideal place to add this feature is the iwear_logger device, as this already has a nice configuration control over which data to be logged. This issue deals with updating the iwear_logger wearable device with the functionality to stream wearable sensor data through yarp ports.

CC @diegoferigo @claudia-lat @DanielePucci

[yeshasvitirupachuri]

This task is achieved in #123

CC @claudia-lat @DanielePucci