MCP Support

### Feature Idea

Hi,

I'm opening this issue to have a conversation about supporting MCP directly into ComfyUI's core directly.

Is this something you would be interested in ? Right now there's a [project](https://github.com/joenorton/comfyui-mcp-server) that provides this feature as a separate server, but provided Comfy is already a rest api, it makes sense to me to implement some level of support direcly into it.

I'm not sure it could be implemented as a ComfyUI extension, but if it is, it'd definitely be my preferred path.

I'm going to start poking at this on my own but wanted to reach out to you in the meantime to get your opinion(s) and ideas relating to this matter.

### Existing Solutions

- An existing implementation as a stand-alone server wrapping calls: https://github.com/joenorton/comfyui-mcp-server

### Other

_No response_