The purpose of this PR is to make it easier to use overlays in the editor.

1. Clarify the createOverlay API.
================================
Before, we mixed up the positioning hook options and the EditorOverlay props.
After, put all the positioning options in the positionOptions props
and move the sequence to the last param, which corresponds to the overlay
system options.

2. Automatically manage the close at pointerdown.
=================================================
Before, the logic for closing overlays outside the overlay was duplicated
in each component use by createOverlay.
After, the overlay editor is responsible for closing overlays when a pointerdown
occurs outsite of the overlay. You can disable this functionality with the closeOnPointerdown=‘false’ props.

3. Managing setSelections when the selection is not in the editable
===================================================================
For example, the selection is in the input of an overlay.
From this commit, when you call setSelection, if the selection is not in
the editable, you no longer force the selection to be moved into the editable,
you just update the activeSelection. When you want to force the restoration
of the selection in the editable, for example when you close an overlay,
you call the focusEditable function.
This change makes it possible to call functions that manipulate the selection
from the outside without having to refocus in the editor.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




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