Implementing chat services

I believe that it's more or less clear how WebSockets works now, and we can apply the API for our chat. However, in a real application, we need something more than to echo sent texts. Let's put the intended event scenarios on paper:

• The Welcome component handles user input and sends via the client to the join server event with the entered user name in the payload
• The server receives the join event, adds a new user to the set, and broadcasts the participants event with the updated set
• The client receives the participants event and passes the set to the Participants component, which updates the participant's list
• The Conversation component handles user input and sends the entered message via the client to the server as the text event with username, text, and timestamp in the payload
• The server receives the text event and broadcasts it to all the chat participants

As we deal with event messages, we need a unified format for sending and receiving a single source of truth...