Add static method the create a BodyFacade from a CenterName
The following method must be added:
/**
* Create a body facade from an input center name.
* @param centerName input center name
* @return a body facade for the input center name
*/
public static BodyFacade create(final CenterName centerName) {
return new BodyFacade(centerName.name(), centerName.getCelestialBody());
}