Add NodeEntity to abstract node classes to get them persisted to neo4j

[konradweiss]

Solves #1373

By adding the @NodeEntity to abstract classes of nodes, neo4j again persists labels like Type, Expression, Declaration. This is only necessary for abstract classes as super classes that are not abstract get the label persisted.

[sonarqubecloud]

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[oxisto]

I was wondering why Node does not have the @NodeEntity. Can you check, whether this also solve the issue?

[konradweiss]

I was wondering why Node does not have the @NodeEntity. Can you check, whether this also solve the issue?

Checked it, unfortunately it did not solve it. Node is an open class and apparently adding the annotation does not propagate to the abstract classes. The Node label, however, was also present before adding the annotation. so the behavior is as what I expected after seeing the FunctionDeclaration label at a ConstructorDeclaration. The OGM assumes that a non-abstract Class represents a label and NodeEntity is only needed in the abstract class case.