Allow to replace the table view by the entity edit form

Problem/Motivation

Currently, if an entity is loaded (in the reference field), you need to click on "Edit" to access the edit form of this entity.
In some case, this is not the best UX choice because the editor would like to have some fields of the entity ready to be edited without this additional click.

Proposed resolution

In the setting form of the widget, add a checkbox like "Always display loaded entities in their edit form"
If checked:
1- the regular table view is never used
2- we can see all the loaded entities in their choose edit form mode.
3- all the "Edit" buttons (for each entity) are not displayed

Remaining tasks

Everything...
Some ideas here: https://www.lowfidelity.at/blog/quick-edit-drupal-inline-entity-form