Feature request

Feature description

Change type of uuid field in GoalInfo.msg to new message type defined in unique_identifier_msgs.

See TODO in GoalInfo.msg.

Blocked by ros2/unique_identifier_msgs#1.

Implementation considerations

This will touch a few places in rcl_action, but the changes should only be minor.

We might also consider changing the type of UUIDs in the generated messages/services for actions; found in rosidl_parser:

https://github.com/ros2/rosidl/blob/075fe35bec2587d5c1012cb6ffec0db61c34277a/rosidl_parser/rosidl_parser/__init__.py#L799-L800

https://github.com/ros2/rosidl/blob/075fe35bec2587d5c1012cb6ffec0db61c34277a/rosidl_parser/rosidl_parser/__init__.py#L822-L823

https://github.com/ros2/rosidl/blob/075fe35bec2587d5c1012cb6ffec0db61c34277a/rosidl_parser/rosidl_parser/__init__.py#L845-L846