Use feature ids in load names instead of simple_uuid

[vtnate]

Any background context you want to provide?

This will simplify access to results of Modelica simulations by naming the Modelica variables with the geojson_id of the load (building). Future work should do the same thing for borefields when modeling GHEs.

What does this PR accomplish?

Update self.id for the loads to use the geojson_id instead of generating a simple_uuid. We retain simple_uuid for objects that aren't being supplied by the geojson file, such as networks, couplings, ETSs, etc.

How should this be manually tested?

CI is sufficient

What are the relevant tickets?

Resolves #645

Screenshots (if appropriate)

[tanushree04]

Looks great @vtnate , does this take care of all modelica variables for buildings in the TimeSerLoa_ format and adds the building feature instead of the UUID?

[vtnate]

Looks great @vtnate , does this take care of all modelica variables for buildings in the TimeSerLoa_ format and adds the building feature instead of the UUID?

That's the intent, yes. Can you generate a model from this branch and confirm that it provides the info you need?

[tanushree04]

I created a new modelica model and ran the results from my script, the variables are now named as per the feature ID, great work!