[TASK] Cleanup Redis classes

Add more typehints and introduce helper methods
to make the code more readable.

Resolves: #104800
Releases: main
Change-Id: I32c9e4a612f59df1f507f1f09b89fa9df772ea21
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85854


Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>