Do we still need Page Manager?

Problem/Motivation

Following 📌 [1.0.0-beta1] Add proper page management Active , do we still need Page Manager ?

Proposed resolution

Evaluate if we keep it or no.

If we keep it, do we keep it in display_builder_page_layout or do we move it to a future https://www.drupal.org/project/display_builder_page_manager → because it is a page_manager is a contrib module ? Like we already do with https://www.drupal.org/project/ui_patterns_ds → and https://www.drupal.org/project/ui_patterns_ds →