had map msgs - respect idl constant naming conventions

ROS2 service call has a hidden naming convention that constants in service request/response must be named as "NameService_Request_Constant" for request message. Failure to do so does not raise an error but constants are not included in the header files.

This merge request fixes the definition of the HADMapService calls to repsect this naming convention, and allows such constant to be declared and used via the header files.