Handle Communication with BDD Test process

[minhnh]

The mockup setup in the behaviour server should handle communication from bdd_exec_ros2, which includes:

• Returning the correct UUID in the result
• Publishing trinary topics and events correctly during FSM execution, where event IRIs should come from the generated header. See Python example in bdd_exec_ros2.
• Trinary topics should be handled through configs/params (TBD)