support query with `ExampleMatcher` on `AggregateReference` properties

[ashraf-revo]

support ExampleMatcher with AggregateReference
ExampleMatcher always ignore any property with AggregateReference because it check if its an isAssociation

[ashraf-revo]

i was able to fix with this change
if (!property.isTransient() && (!property.isAssociation() || property.getActualType().equals(AggregateReference.class)))