[TASK] Add SystemStatusCheck for PostgreSQL

The SystemStatusCheck for PostgreSQL checks the server and the libpq version.
It’s important to use the correct libpq version as this will lead to problems
if it differs to much from the server version.

Change-Id: I370b57cc8e516624ee7a299b0c3710d834175386
Resolves: #79331
Releases: master
Reviewed-on: https://review.typo3.org/51368


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