[!!!][TASK] Add modern typing to ClassNamingUtility

Simple type additions. Nothing exciting.

Resolves: #97205
Related: #97210
Releases: main
Change-Id: Ic38274300b22f3ce9168e98c13239934c624069a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73987


Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>