Connection to socket. io rooms for voice

[hugoponthieu]

You should first complete #19.
You can see more specification of that flow here.

We need to use rooms of socket io framework to implement the connection in a channel.

Two methods are needed connect/disconnect. You will implement this in the channel gateway. Those two methods will also implement the methods created in #19 to store the state of connections in channels.

Sockets rooms should be identified with the channel id therefore those methods should just receive the channel id as props

This has already been implemented in by the voice group here

Issue 3019: Bonus

Bonus issue

If you have time you can focus on this task which may take time

You will find all the instructions in this short video

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