Demo to showcase bug with Neo4jMappingContext.getChildNodeDescriptionsInHierarchy()

Shows inconsistent behavior of Neo4jMappingContext.getChildNodeDescriptionsInHierarchy() for deeper class hierarchies.

Run:

./gradlew bootRun

Noteworthy files:

• Model.kt: contains model classes
• Monitor.kt: logs getChildNodeDescriptionsInHierarchy for each NodeDescription