Support for streaming messages about jupyter-chat

[jtpio]

This might already be possible in some way by a plugin, by calling the updateMessage method:

jupyter-chat/packages/jupyter-chat/src/model.ts

Lines 76 to 85 in 5cf3955

	/**
	* Optional, to update a message from the chat panel.
	*
	* @param id - the unique ID of the message.
	* @param message - the updated message.
	*/
	updateMessage?(
	id: string,
	message: IChatMessage
	): Promise<boolean | void> | boolean | void;

[brichet]

This might already be possible in some way by a plugin, by calling the updateMessage method:

Yes, this is possible but will call the RendermimeMarkdown for the whole content on every update.

To avoid this, we could find a way to tell the message component to append the new content to the DOM, using the appendContent flag:

jupyter-chat/packages/jupyter-chat/src/components/rendermime-markdown.tsx

Lines 78 to 80 in 5cf3955

	(appendContent ? (
	<div ref={node => node && node.appendChild(renderedContent)} />
	) : (

[jtpio]

Linking to jupyterlab/jupyter-ai#228 as related.