[TASK] Do not mis-use sys_page for using cache_hash in ExtDirectApi

The ExtDirectApi simply calls PageRepository to store data in the "cache_hash"
cache. This can be simplified by just using the Caching Framework directly
without depending on a EXT:frontend class in a EXT:core class.

Resolves: #80517
Releases: master
Change-Id: I77825bf71264621fb984b39f79009baf71cfdec3
Reviewed-on: https://review.typo3.org/52214


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>