Dedicated settings UI for AI related projects

[brichet]

Problem

Jupyter-ai v3 now consists of several extensions (server and frontend), each of which can have its own settings.

It might be helpful to have a dedicated settings panel for AI-related projects, to make it easier to find them.

Proposed Solution

1. Add a new extension that would provide a token for an AI settings panel.

   Any extension that needs to make user settings available could consume this token and add its component/settings there.

   Could/should we reuse the SettingsEditor widget, by providing a new SettingRegistry ?

2. Another option (simple) could be to use the settings system of Jupyterlab with filtering keywords (e.g. _ai_). The shortcut would call commands.execute('settingeditor:open', { query: '_ai_'})

Additional context

• AFAIK only jupyter-ai-jupyternaut exposes frontend settings, without using the regular settings registry system.
• if we move forward with MCP servers manager extension #1567 (and Use jupyter-mcp-manager jupyter-ai-contrib/jupyter-ai-persona-manager#49), that would be another extension providing user settings.