gh repo create: Prompt for owner when repo name is un-prefixed #6574

Describe the feature or problem you’d like to solve

When creating new repos interactively, users are only prompted for a repo name, and it's not immediately clear that names can be prefixed in order to create the repo in an Organization.

Proposed solution

If I enter an un-prefixed name, I'd like to be presented with a select prompt containing my personal account name (the default) and all organizations I am a member of:

? Repository name my-project
? Repository owner  [Use arrows to move, type to filter]
  climbcomp
  gostamp
> twelvelabs

If I'm not a member of any orgs, then I would not see the "Repository owner" prompt.

Selecting an org would cause that prefix to be added to my-project. Selecting my personal account would leave the name un-prefixed.

The org selection could also be used to determine which visibilities to present (re: #2106).

Additional context

This info seems easily retrieved via gh api /user and gh api /user/orgs, so I guess it's a matter of whether y'all think the UX is worth the added complexity. Personally, I like the explicitness of the prompt: "this is exactly where your repo will be created".