[TASK] Harden \TYPO3\CMS\Extbase\Security\Cryptography\HashService

- Use strict type mode
- Use type hints whereever possible

Releases: master
Resolves: #87595
Change-Id: If59546093176c5a7725725aad8e619de70fd43cd
Reviewed-on: https://review.typo3.org/59590


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Felix Döring <Felix.Doering@3m5.de>
Reviewed-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Tested-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: André Schließer <andy.schliesser@gmail.com>
Tested-by: André Schließer <andy.schliesser@gmail.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>