Move tab to a new window

[mitchellh]

Discussed in #2625

^{Originally posted by jcollie November 8, 2024}
Currently (with libadwaita enabled) you can move a tab to another existing window by dragging the tab header from one window to another. I propose adding a keybind action and corresponding context menu entries to move a tab to a new (previously non-existent) window where it would become the first and only tab in that window.

Design

1. Add move_tab_to_new_window binding
2. Add the associated apprt action
3. Implement for GTK and/or macOS
   We can support both platforms for this one.