rename from introspection_message handles to event_message handles

Signed-off-by: Brian Chen <brian.chen@openrobotics.org>

rosidl_runtime_c/include/rosidl_runtime_c/service_type_support_struct.h

@@ -53,7 +53,7 @@ typedef struct rosidl_service_introspection_info_s {
  * \param[in] enable_message_payload Whether to enable message payloads in the ServiceEvent message
  * \return The built ServiceEvent message. Will return NULL if the message could not be built.
  **/
-typedef void * (* rosidl_service_introspection_message_create_handle)(
+typedef void * (* rosidl_event_message_create_handle)(
     const rosidl_service_introspection_info_t * info,
     rcutils_allocator_t * allocator,
     const void * request_message,
@@ -68,7 +68,7 @@ typedef void * (* rosidl_service_introspection_message_create_handle)(
  * \param[in] event_message The message to destroy.
  * \param[in] allocator The allocator to use for deallocating the message.
  */
-typedef bool (* rosidl_service_introspection_message_destroy_handle)(
+typedef bool (* rosidl_event_message_destroy_handle)(
     void * event_message,
     rcutils_allocator_t * allocator);
 
@@ -82,9 +82,9 @@ struct rosidl_service_type_support_t
   /// Pointer to the service type support handler function
   rosidl_service_typesupport_handle_function func;
   /// Pointer to function to create the introspection message
-  rosidl_service_introspection_message_create_handle introspection_message_create_handle;
+  rosidl_event_message_create_handle event_message_create_handle;
   /// Pointer to function to finalize the introspection message
-  rosidl_service_introspection_message_destroy_handle introspection_message_destroy_handle;
+  rosidl_event_message_destroy_handle event_message_destroy_handle;
   /// Service event message typesupport
   const rosidl_message_type_support_t * event_typesupport;
 };