HHH-2510 override equals() and fix hashCode() in AliasToBeanResultTransformer

AliasToBeanResultTransformer.hashCode relied on propertyAccessor.hashCode(). Implementations of PropertyAccessor do not override hashCode() or equals(). Therefore, Cache lookups involving a QueryKey with an AliasToBeanResultTransformer resulted in a cache miss. Two AliasToBeanResultTransformer objects should only be equal and use the same hash code if their resultClass is equal. Getters are determined by aliases, which are provided as an argument, so they are not needed to determine equality. Setters should be used to compute equals() and hashCode(). However, due to the implementations of Setter, Setters do not override hashCode() or equals(). The fix is to cache the aliases corresponding to the Setters and use that to check for equality. Cache lookups involving a QueryKey with an AliasToBeanResultTransformer no longer result in a cache miss.