Add space point reader

This is a follow up from !68657 (merged)

This adds an algorithm for retrieving the space points objects from a file (if they are available) and attach a decoration to them. The decoration is a vector of bare pointers to the clusters. In a few words: persistified space points have element links to the clusters, we retrieve the element link and attach the bare pointers as decorations.

The configuration checks if the input files has the space point collections, and if so, schedules the algorithm (one per space point collection)

We'll do the same for ACTS MTJ and track's backends

/cc @tadej @akraszna @ncalace @tbold

JIRAs: ATLIDTRKCP-550 and ATLIDTRKCP-532