Provide class for inspecting nested projections.

[meistermeier]

As a result there will be a Map<PropertyPath, Boolean>, indicating if the property path "ends" in an entity or not, that can get used as input for a selection/mapping filter in the dedicated store modules.
Maybe it might makes sense to wrap the Map<PropertyPath, Boolean> into an own class. For us it is sufficient right now to use the map.

[schauder]

Isn't a Map<X,Boolean> simply a Set<X>? Or do we need the ternary logic of "it neither bescause it isn't in the Map"?

[meistermeier]

This is the problem with partially extracted and outdated documented things (This class is responsible for creating a List of..). In the end we (SDN) need the information if the PropertyPath points towards an entity or not (simple type, other projection definition).

[christophstrobl]

Thanks @meistermeier! Now available on main now.