Handle disconnection of non-root node

[Lakshya2610]

When a node disconnects (non-root node), it's immediate clients need to restart the connection process to the room.

• Once the connection is established, the nodes should update their immediate children with new Media Tracks.
• This should recursively update the entire affected part of the network
• The tricky part here is how to update the tree in the back-end. Because, there are multiple nodes joining the tree (rejoining) in a single connection request. (The node that initiates the connection request, and its children)

[Lakshya2610]

Implemented in commit https://github.com/grey-software/toonin/commit/5e63b8667dc5f110226db94be9f2cbe73acb72f0 on "distributed-streaming-sys" branch