[FEATURE] Add native browser lazy loading for images

This change adds the browser-native lazy loading option "loading"
HTML attribute for images.

See https://addyosmani.com/blog/lazy-loading/ for more details.

Resolves: #90426
Releases: master
Change-Id: I5c457ed5b72ef81622e5135f182d7b10ededd4df
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63317


Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Christian Eßl <indy.essl@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Eßl <indy.essl@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>