Feature request: Allow page duplication

Summary:

The multipage feature is great! but it still lacks some options such as allowing one to duplicate a page.

Steps to reproduce:

• Open Inkscape
• Click on the "Create and edit multipages" tool and create a page.
• Select the page and duplicate it (or press Ctrl + D )

What happened?

• Nothing happens because this is not possible yet.

What should have happened?

• It should duplicate the page with its content.

Version info

Inkscape 1.2-dev (8e25dab, 2022-01-22)

    GLib version:     2.64.6
    GTK version:      3.24.20
    glibmm version:   2.64.2
    gtkmm version:    3.24.2
    libxml2 version:  2.9.10
    libxslt version:  1.1.34
    Cairo version:    1.16.0
    Pango version:    1.44.7
    HarfBuzz version: 2.6.4

    OS version:       Ubuntu 20.04.3 LTS