[FEATURE] Current storage pid marker in where clause

Marker ###PID_IN_USE### is introduced in the mapping where_clause
property, to be replaced by the current storage pid.

Resolves: #56270
Releases: 2.3
Change-Id: Icf2cdb4da3a468e9558627126a46a50b441fc2ca
Reviewed-on: https://review.typo3.org/30504
Reviewed-by: Francois Suter
Tested-by: Francois Suter