Support webform submission entity

Problem/Motivation

I would like to suggest supporting the webform submission entity to send notification based on action.

I've tried to add the webform submission entity to the additional entity types in the logger settings, but I faced the below error when I opened the widget settings:
InvalidArgumentException: Field label is unknown. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 583 of core/lib/Drupal/Core/Entity/ContentEntityBase.php).

Steps to reproduce

Proposed resolution

I've created a patch to add the webform submission to the logger service, but I think we can add more to the settings page.

Remaining tasks

User interface changes

API changes

Data model changes