Decide on a way to distinguish bots & users

[dlqqq]

Problem

Currently, the YChat API doesn't make a distinction between users connected from a browser & bots connected from a server extension.

Proposed Solution

Add some way to distinguish between human users & server bots in the return type of YChat.get_users() and other similar methods.

We should also consider renaming this method to YChat.get_clients(), since a client may be a user or a bot.

[brichet]

Thanks @dlqqq for opening this.

Although I agree with the need to distinguish the type of client, I wonder where this should live.

• This information seems more related to jupyter-ai than jupyter-chat itself. We could allow this additional information in jupyter-chat, so that it can be customized in other extensions that use it.
• There are currently some work in progress for a suggestions system in collaborative document (e.g. Support suggestions jupyter-collaboration#292). We could easily imagine suggestions from a bot. In this case, I believe that this information should be define at a Jupyter level, to be used by any extension.

And to complete this issue, we should also consider that bot users may come from the front end, e.g. https://github.com/jupyterlite/ai.