Add hints for entities package-private methods

[odrotbohm]

Given an entity class

@Entity // could be @Embeddable etc.
@Access(AccessType.PROPERTY)
class Foo {

  String bar;

  void setBar(String bar) { … }
}

This type is usable in standard Hibernate, as the package-protected setBar(…) will be available to Hibernate. In a native image, that method is not available as PersistenceManagedTypesBeanRegistrationAotProcessor calls BindingReflectionHintsRegistrar.registerReflectionHints(…) which only considers public methods.

[github-actions]

Fixed via 5aec239