Implementation of chat features

[Philaeux]

Label: Enhancement

Methods

• [x] Join a target chat
• [x] Leave a specific chat
• [x] Send a message to a chat
• [x] Share the current lobby into the chat
• [x] Share the user profile into the chat
• [x] Flip a coin into the chat
• [x] Roll a dice into the chat
• [ ] Get a list of chat channels from GC

Events

• [x] A new message in a chat
• [x] A user join a chat
• [x] A user left a chat