[FEATURE] Add possibility to use session data in TS conditions

Since the session API has been adjusted it is no longer possible
to access the (now protected) sesData property of the fe_user object.
Using TSFE:fe_user|sesData|foo|bar in a TS condition will trigger
a deprecation log entry.

Instead a cleaner approach is now available:
 [globalVar = session:foo|bar = 1234567]

Resolves: #83506
Releases: master
Change-Id: Idbb079334186eac1dfe062a71a601e556a9bd247
Reviewed-on: https://review.typo3.org/55310


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>