fix: add __init__.py file to communication/ros2 folder

src/rai/rai/communication/ros2/__init__.py

@@ -0,0 +1,17 @@
+# Copyright (C) 2024 Robotec.AI
+#
+# 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.
+
+from .api import ROS2ActionAPI, ROS2ServiceAPI, ROS2TopicAPI
+
+__all__ = ["ROS2ActionAPI", "ROS2ServiceAPI", "ROS2TopicAPI"]