Make chat UI

[light-and-ray]

Add a minimalist simple chat UI based on gradio chat components with the only 1 purpose - allow you to use LLM on the same GPU where you use Comfy

Proposal:

1. Can enable in settings
2. A separate UI available on a link
3. Interrupt and restart the current task in mcww uii, keep it on pause while llm generating answer
4. Unload LLM callback that is executed before comfy ui generation beginning
5. Clear cache and models before calling LLM

[light-and-ray]

Because Comfy added native node for LLMs - alternative proposal is to make special categories for text generation nodes, e.g. input image, user prompt, system prompt, conversation history. Either make a special page for them or use the same project page among other workflows, just s different layout