Add a button in omni panel

[someghuser]

In the omni panel add a button like ComfyUI Manager button. And it generates and downloads the python script. I'm not sure if this is possible, but the environment is loaded so it doesn't have to look for cuda, rocm or others.

[pydn]

I think this is a really great idea and a feature I'd like to add. I haven't had time to add new features lately, but am open to pull requests!

[atmaranto]

I currently have this feature implemented in this fork. The one downside is it can't determine which nodes are custom by default, so the resultant script must load custom nodes.
@pydn, would it be worth creating a pull request or maintaining the fork separately? I'm planning to add a few more features.