Add a virtual destructor to suppress compiler warning (#502)

Signed-off-by: Michael Carroll <mjcarroll@intrinsic.ai>

ros_gz_bridge/CMakeLists.txt

@@ -129,6 +129,7 @@ add_library(${bridge_lib}
   src/bridge_handle_ros_to_gz.cpp
   src/bridge_handle_gz_to_ros.cpp
   src/factory_interface.cpp
+  src/service_factory_interface.cpp
   src/service_factories/ros_gz_interfaces.cpp
   src/ros_gz_bridge.cpp
   ${convert_files}

ros_gz_bridge/src/service_factory_interface.cpp

@@ -0,0 +1,24 @@
+// Copyright 2024 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "service_factory_interface.hpp"
+
+namespace ros_gz_bridge
+{
+
+ServiceFactoryInterface::~ServiceFactoryInterface()
+{
+}
+
+}  // namespace ros_gz_bridge

ros_gz_bridge/src/service_factory_interface.hpp

@@ -29,6 +29,8 @@ namespace ros_gz_bridge
 class ServiceFactoryInterface
 {
 public:
+  virtual ~ServiceFactoryInterface() = 0;
+
   virtual
   rclcpp::ServiceBase::SharedPtr
   create_ros_service(