Follow-up to #55957 and #66479

What

We want to display hierarchical data in WordPress 7.0.

This is the current state: it works with the Gutenberg plugin active. It's supported by the table layout, and it mimics wp-admin states: initial load, pagination, search, and filter maintain hierarchical order; sorting does not.

How

• Update REST API to support these interactions. Core PR at Add logic to sort posts by hierarchy wordpress-develop#8014 We may also reconsider rethinking the approach so that the REST API endpoint can "return the children of X" — it could be useful in other scenarios such as command palette.
• The level is not clear: add spaces between the dashes, like wp-admin does. DataViews: display a separate — for each level #74199
• Once you sort by a column, to come back to the hierarchical sorting, you need to reset the whole view (see video). We need to fix this so it's easier. Potential direction: add a "sorting by: hierarchical" config.
• When in a page > 1, consider displaying the parent if the first item is a child page.

wp-admin	site editor > pages

After these all are done, we may also want to explore collapse/expand behavior in the table (example1, example2).