Add common `DockerObject` parent to every model class (#1635)

* Add common `DockerObject` parent to every model class

* Fix `DockerObjectArchTest`

* Remove `callSuper`, do not extend meta-objects from `DockerObject`

* Do not extend `@JsonCreator`-based objects from `DockerObject`

* Put back `@EqualsAndHashCode` on `Volume`

* Put back `@EqualsAndHashCode` on `ExposedPort`

* Add exclusions to `ModelsSerializableTest`

* Properly add exclusions to `ModelsSerializableTest`

* Use `DeserializationContext#readTree`