[Feature Request] Add Socket connection

[bartvanb]

Problem description
The vantage6 server and nodes have a socket connection between them, via which events such as "this task just started/finished/crashed" and "this node just came online" are shared. The UI should connect to the socket channel so that they can also read these messages

Desired solution

• connect to socket channel
• Give alerts to significant events (same as old UI)
• Option to kill tasks that are running (same as old UI)
• Update node status of nodes showing on current page if they are going on/offline (same as old UI)
• Update task status for tasks showing on current page (same as old UI)

Additional context
In the old UI there is a socket.message.service and a socket-connect service.

[bartvanb]

We may be able to work around this and implement API polling mechanisms - this could be a quick way to get around implementing socket connection but this is preferred long term solution

[bartvanb]

Notes:

• killing tasks is separated in issue [Feature Request] Kill tasks #187
• I've not implemented the notifications for the user as they may be too distracting

[bartvanb]

Fixed by #196