Entity type id and bundle conflict

Problem/Motivation

I want to use it for drupal commerce, notifying the creation of an order and an invoice, with Commerce Invoice, adding the system names in the additional entity types, but there was a conflict in the form config because the bundles were the same "default".

Proposed resolution

Using comment patch #18 🐛 Notifications Widget settings: taxonomy and node system name conflict Needs review for this same issue between nodes and terms. And add of the bundle entity type in front of the configuration keys for additional entity types, in the config form and the service for creating notifications.

Note that I made these modifications so that the creation of notifications could be created, but there are still codes to correct in this way.