ServiceRequest Built-in Topic

Summary: Builtin topic for accessing requests from different services within dds.

Currently, the DDS.TopicQuery, Locator Reachability Instance State Consistency and Controlability (part of Observability) all rely on this topic.


See also: @ref DDSTopicQueryModule for an explanation of how TopicQueries use ServiceRequests and how you can access the ServiceRequests for debugging purposes in the section @ref ServiceRequestBuiltinReader.