Add parameter to include hidden topics and services (ROS 2)

[achim-k]

Public-Facing Changes

• Add parameter to include hidden topics and services (not included by default)

Description

Adds the new parameter include_hidden which controls if hidden topics or services are advertised.

From https://design.ros2.org/articles/topic_and_service_names.html#hidden-topic-or-service-names:

Any topic or service name that contains any tokens (either namespaces or a topic or service name) that start with an underscore (_) will be considered hidden and tools may not show them unless explicitly asked.

[jtbandes]

🎉