Include and extract semantic information from BOPTEST testcases

[anandkp92]

This issue is to track the development of semantic model inclusion and extraction from BOPTEST testcases.
The efforts starts with an implementation in the multizone_office_simple_air testcase.

• adding annotations containing semantic information to Modelica model
• validate information added
• using modelica-json to extract the semantic model from them
• validate the semantic model that has been extracted
• include this workflow into the BOPTEST API

[anandkp92]

The development branch to handle this issue is another fork: https://github.com/anandkp92/project1-boptest/tree/issue591_semantics

[dhblum]

Thank you @anandkp92. This is great. A general comment, the last item about integration into BOPTEST API should focus more on the user's experience of accessing the semantic model/information, whereas the first four items relate to the workflow of a test case developer to include a semantic model in the Modelica and extract for inclusion in the test case. Just delineating a bit the target audiences/use cases.

[dhblum]

@EttoreZ FYI.

[dhblum]

Referencing #360.