[WebUI] Add support for webui

[kerthcet]

What would you like to be added:

Once we launched a model, we can simply co-launch a webui for interaction, we can support llmpos tools like dify but maybe we can find or create a lightweight one like gradio.

We also have a repo located here which implemented with gradio https://github.com/InftyAI/llmaz-dashboard.

Why is this needed:

For better UX.

Completion requirements:

This enhancement requires the following artifacts:

• [ ] Design doc
• [ ] API change
• [ ] Docs update

The artifacts should be linked in subsequent comments.

[kerthcet]

/kind feature

[kerthcet]

/help

[kerthcet]

/milestone v0.2.0

[kerthcet]

~see https://github.com/InftyAI/llmchat/issues/30~

This is pending for https://github.com/InftyAI/llmaz/issues/339 to get the model list.