Add annotations for Pre-&Post-Hooks when (de-)serialize an VO

[noctarius]

When serializing or deserializing an valueobject it should be possible to add pre- and posthooks in form of annotated methods to handle additional behavior.
Annotations could be in form of @PrePersist annotions of JPA.

@PreSerialize
@PostSerialize
@PreDeserialize
@PostDeserialize