[FEATURE] Access site configuration in foreign_table_where

This patch adds the possibility to access site configuration
with a placeholder in TCA's `foreign_table_where` query.

To access a configuration value the following syntax is available:

* ###SITE:rootPageId###
* ###SITE:foo.bar.baz### (array path notation)

Resolves: #94662
Releases: master
Change-Id: I2047085d20c914960bbcd88df5b4c7a7f8d53282
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70126


Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>