[FEATURE] Add PSR-14 Event for fetching YouTube/Vimeo preview image

A new event is added to modify
the preview image for online media
providers.

Resolves: #99312
Releases: main
Change-Id: I67846fb5eefa2cfd5b41208bf4ef7ee4270ed1df
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76994


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Robert van Kammen <rvkammen@hotmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>