Preserve scroll position and focused item after component edit or move

In the "External SPA Editor", the page scroll and focussed element should be preserved after creating, editing, or moving a component to ensure a good author experience. 

The author experience should be the same as if they were using the normal page editor.

Acceptance criteria

The implementing developer should not need to do anything extra to achieve this, it should be provided by default. 

Technical notes

This might be implemented in the "Page editor bridge" code.