DDSXTY12 — Add a @non-serialized annotation

Section 7.4.1.3 "Extension to RTPS Standard DCPSParticipants Builtin Topic" of the DDS-Security 1.0 specification defines a @non-serialized annotation. This is used to indicate that a member of an aggregate type should not be serialized.

This annotation should be moved to XTYPES since it is not specific to DDS-Security and may be needed for other data-types.

Add a @non_serialized annotation

A @non_serialized annotation is currently defined in the DDS-SECURITY specification. It is not specific to security though, so we are moving it to the XTYPES specification.