Rework the data annotation and scenario comparison integration

Description of the issue

SInce we first implemented the scenario comparison as part of the scenario bundles we collected alot of feedback. We noticed that the annotation workflow is very flexible yet it lacks a clear guideline on how to annotate more complex formats like IAMC which uses combined variables.

Previously we only applied the comparison workflow to specifc use case tables. They have been quite simple and only included data on GHG´s and CRF sectors. Also the Semantic Mapping we generated for these tables and the frontend which rendered the data graph are not fully dynamic and not stable to include other datasets easily.

Ideas of solution

• Provide a clear "how to annotate" guide
• Refactor frontend and current mapping workflow to be fully dynamic - no hardcoded terms / relations
• Enhance the mapping generator to be more flexible to support multiple data formats

Workflow checklist

• I am aware of the workflow in
  CONTRIBUTING.md