The addition of a repaint prompt function

[philocalyst]

Basics

• I have done a basic search through the issue tracker to find similar or related issues.
• I have made myself familiar with the available features of Nushell for the particular area this enhancement request touches.

Related problem

In fish, there is the commandline -f repaint function. It's very useful(vital) for async prompt setups.

Describe the solution you'd like

I would like Nushell to implement some version of this function for replacing the prompt in-place, for tools like Starship to eventually take advantage of (Instead of blocking the paint)

Describe alternatives you've considered

No response

Additional context and details

No response

[fdncred]

I think we'd accept a PR for this.