Server-side parent step computation

[schustmi]

Describe changes

This PR adds logic to compute the parent steps server-side. This means the client does not need to fetch all upstream steps anymore to create a StepRunRequest, which should improve performance especially when having large fan-in steps.

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[stefannica]

This is the only change I didn't understand. Did you move this after to_model to keep the step model clean of upstream steps?

[schustmi]

I only did that for an easy way to get the upstream_steps, which are already parsed as part of the spec of the model, but would be a raw json string when fetching from the schema. This step_model here anyway is not the final one, but only an intermediate one used for the same purpose already (easy access to parsed json fields)