service_name length checks for different rmw_implementations

[rohitsalem]

As of now checks for both the service names and topic names are same, but there should be separate length checks for service names as the service names are suffixed with a Request or a Reply in rmw_dds implementations which limits the actual length of the service names that can be used. Note: special consideration for rmw_connext implementation which suffixes the GUID of the participant to the service_name along with Reply. See: ros2/rmw_connext#285