[FEATURE] Add context check for TypoScript

The new Context API is added so TypoScript
can check this in cObject like this:

10 = TEXT
10.data = context:workspace:id

where as the key is context:[aspectName]:[propertyName]

Arrays are automatically converted to comma-separated lists,
which is useful for reading info on user groups.

Resolves: #85550
Releases: master
Change-Id: I86673055e088ec4e65288df6145399f8e45055c8
Reviewed-on: https://review.typo3.org/57588


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>