[FEATURE] Add TypoScript conditions based on the site configuration

Two new TypoScript conditions are added to check for the currently
used site configuration of a Frontend Request.

[site = identifier = angelo]
[site = base = https://www.benni.com/]
[siteLanguage = typo3Language = default]
[siteLanguage = locale = de_CH.UTF-8]

Resolves: #84760
Releases: master
Change-Id: I6914211871de1cfc15c5ac0e4ed5ed2d245b39e8
Reviewed-on: https://review.typo3.org/56711


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>