[TASK] Add event to intercept/adjust request-token

Add new BeforeRequestTokenProcessedEvent, allowing to intercept
or adjust a RequestToken during active user authentication process.

Resolves: #99232
Related: #97305
Releases: main
Change-Id: Iaa6cf7ca0ab2ab54fa1faa9a8fe6dcc76ef58ec9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76868


Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>