Add support for unwrapping a XMLElement into other XMLElement

[ChandrasekharRajoli]

Looking for a solution to unwrap an XMLElement into other XML Element, similar to @JsonUnwrapped

Example :

Car class

public class Car {
  private String carModel;
  private Engine engine;
}

Engine class

public class Engine {
  private String capacity;
  private String power;
}

Expected XML for some scenarios should be like below.

<car>
<carModel>Audi</carModel>
<capacity>500L</capacity>
<power>200<power>
</car>