Allow specifying "root" page in Page List block

[brylie]

What problem does this address?

Related to #31063

It would be useful to be able to specify the "root" page in a page list so that only children of that page would render in the list. For example, when allowing users to navigate within a section of a website where the sibling pages are all relevant.

Similarly, it would be useful to control the depth rendered in the list.

What is your proposed solution?

Basically, the Gutenberg Page List block should emulate the wp_list_pages method, allowing users to specify the child_of, depth, and other related properties.

In PHP, the code for rendering sibling pages

<?PHP
     $parent = get_parent_page();

     wp_list_pages(
          array(
               'child_of'  => $parent,
               'show_date' => '',
               'depth'     => 3,
               'title_li'  => '',
          )
     );

?>

[talldan]

I think there are existing issues for this - #31063 and #29585, so I'll close this one as a duplicate.

Thanks for reaching out though.

edit: Oh, I see this is slightly different. Still, I think it'd be worth rolling this into #31063 as it's so similar. I'll add a comment there.