Draft: Add object import from JSON data

One aim of this fork is to be able to allow for the usecase of the KoMa.

Currently, this tool requires all objects besides the scheduling (like AKs) to be created through the backend interface. This MR adds the functionality to import objects specified in a JSON file. Doing this allows to import from other sources (like a wiki). As a specification of the import JSON format we make use of the KoMa optimizer specification. This has the downside that some features of this tool cannot be represented in the file.

It should be noted that this is not the recommended workflow. However, without such a feature an interop with the KoMa workflow is harder.