Allow automatic creation of videos when bunny.net finishes processing

Problem/Motivation

Add the missing functionality to auto-create media entities of the videos when bunny.net finishes processing the videos. The module have the hability to lisent webhooks from Bunny.net, and with webhooks we can now when a video is ready (https://docs.bunny.net/docs/stream-webhook).

Proposed resolution

Add an event listener to create media entities and update the configuration form to enable and disable this feature.

User interface changes

New options available in configuration form.