Add a "new window" item to the workspaces menu

[carlos-zamora]

Description of the new feature

The workspace menu looks like this:

It'd be nice if there was a "new window" option. That way, a user can create a new workspace/window while they're already in that flow

Originally filed in 9/1 Bug Bash

Proposed technical implementation details

No response

[search1ofall-maker]

Hi Carlos Zamora (@carlos-zamora)! I'd like to work on this issue.

I'm a first-time contributor to the project and this looks like a great entry-level feature to get started with. Could you please assign this to me?

Also, if you could briefly point me to the XAML/UI component where this workspace menu is defined, that would be super helpful. Thank you!