[Chat]: Additional features

[annawen1]

From Daniel:

• on-click event when user clicks a message in the chat
• it could be nice if in the chat, when it is a bot message, right next to the AI slug where it says {AI time} if you could instead allow me to provide a string that you would then put instead of AI next to the time
• set the chat to state "loading" programmatically
• ability to disable input - without hiding the whole chat window
• ability to set the input prompt myself - currently it says "Type something..." always i would like to be able to overwrite that
• response contains a tabular result
• response contains a vega lite