Experiment about DataCollector Idea

[sbernard31]

Here are some idea about DataCollector.

This is very crappy code just to share :

• ideas
• detect and begin to discuss about some issue.

I think maybe a first version of the code could contains only :

• ManualDataCollector
• maybe remove the support of several DataCollector.
• I don't know if we keep DataCollectorManager ?

Then with this ManualDataCollector this should be enough for :

• write unit test
• add some CLI commands to leshan client demo

About CLI, we can imagine to add a collect interactive command (e.g. : collect /3/0/1 /3/0/2)
And also add an option to send interactive command which is send --collected-data.

[sbernard31]

Data Collector was replaced by Data Sender. (See #1274)