The "pages" REST endpoint doesn't include nested pages

The "pages" REST endpoint only lists terminal pages in the specified spaces and there's no way to list nested pages.

For example:
http://localhost:8080/xwiki/rest/wikis/xwiki/spaces/Sandbox/pages

The code is at https://github.com/xwiki/xwiki-platform/blob/19ae43ec1a31eee5af6fdf43f506e48d0be9960b/xwiki-platform-core/xwiki-platform-rest/xwiki-platform-rest-server/src/main/java/org/xwiki/rest/internal/resources/pages/PagesResourceImpl.java#L60 and the query doesn't search for nested pages.