[DoNotMerge] Models discrepancies. This PR attemp to document a discussion.

[ipa-nhg]

‼️ ‼️ DO NOT MERGE ‼️ ‼️

Modify the Readme model example to follow the current DSL implementation from Fhg IPA. This commit was only made to open the discussion. Once everything is clarified, the branch can be deleted.

To Change from IPA model:

• "sensor_msgs.Image" -> "sensor_msgs/msg/Image" --> ipa320/RosTooling@a7896fd
• Identation for the interfaces under the node (e.g., publishers) --> ipa320/RosTooling@de87909

To Change from URJC model

• FromGitRepo -> fromGitRepo ( I think this does not require code changes)
• Extension of the file (.ros2)
• Put the system description in a separate file, with the .rossystem extension
• Change the qos keywords:
  • qos_profile -> profile
    • "sensor_qos" -> sensor_qos
  • qos_reliability -> reliability
    • "reliable" -> reliable
  • qos_history_depth -> deph

For a complete implementation of the qos part, here is the full DSL implementation: https://github.com/ipa320/ros-model/blob/main/plugins/de.fraunhofer.ipa.ros2.xtext/src/de/fraunhofer/ipa/ros2/Ros2.xtext#L30-L37

[ipa-nhg]

@fmrico I have created this PR to document the conclusions of our meeting on Tuesday. If I have forgotten something or did not understand your opinion.

[fmrico]

I should check this in #3 🤔