[FEATURE] Enable webp support in ImageMagick/GraphicsMagick

TYPO3 now supports generation of webp images by default
if ImageMagick / GraphicsMagick supports this.

A new report in the reports extension detects any
misconfiguration.

webp is an image format that is supported by all modern
browsers (https://caniuse.com/webp), which has a similar
quality to jpeg compression while having a smaller file
size.

By default, webp is now in the list of available
image file extensions to be generated in
$TYPO3_CONF_VARS[GFX][imagefile_ext].

If an admin wants to opt out of webp, they can remove
"webp" from this setting in their settings.php file.

Default quality of webp can be configured via
$TYPO3_CONF_VARS[GFX][webp_quality].

Resolves: #96925
Resolves: #88537
Releases: main
Change-Id: If3fe5efafc8a1c13fbc5c1aa7cd67e4a98bf0346
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82196


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>