Implict many-to-many relationships

[dmateiu]

When adding a reference to another model, it would be nice if you could specify the cardinality of the relationship (one-to-one, one-to-many, many-to-many).
It could add the necessary fields to the respective models in the schema.

I'd be happy to help and open PR for this.

Funding

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[susatpute]

@albingroen
This is most needed feature. Others features can be awaited.
Also when I import from existing schema so that I can add new models, it does not import previously defined relationships.
(cardinality and modality).

I am ready to sponsor depending on commitment date to deliver.