Artifact-like Output Window for gptel

[guibor]

Description
Implement an artifact-like output window for gptel that displays substantial, standalone content generated by the AI in a dedicated buffer separate from the main conversation. This feature would enhance gptel's functionality by providing a more interactive and visually appealing way to work with large AI-generated outputs.

Proposed Functionality
Dedicated Output Buffer: Create a new buffer called "gptel-artifact" to display large AI responses.
Side-by-Side Display: Show the artifact buffer alongside the main gptel conversation buffer using display-buffer-in-side-window or a similar function.
Syntax Highlighting: Apply appropriate major modes to the artifact buffer based on content type (e.g., markdown-mode, org-mode, or language-specific modes for code).
Version Control: Implement a simple version history for artifact content, allowing users to revert changes or view previous versions.