Connect users on room create

[gibsonbailey]

@ mention of reviewers

@ckcollab

A brief description of the purpose of the changes contained in this PR.

Before:

• user_1 and user_2 connect to chat websocket
• user_1 creates new chatroom with members user_1 and user_2
• user_1 sends message to new chatroom
• user_1 never receives the repeated message from the websocket to confirm that the message was successfully sent
• user_2 never receives message, because he connects to the rooms when he connects the websocket

Now:

• user_1 and user_2 connect to chat websocket
• user_1 creates new chatroom with members user_1 and user_2
• The list of chatrooms that user_1anduser_2` are listening to is automatically refreshed
• user_1 sends message to new chatroom
• user_1 receives reflected message back from server, confirming that his message was successfully consumed by server
• user_2 receives message from the room broadcast

Misc. comments

Running into this case in Udayos. This should fix it.

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• Ready to merge

[ckcollab]

Nice test yo