(examples): Add step functions to seq example
Description
In conjunction with the work Lars did in !254 (merged) this adds some more examples by means of step functions which demonstrate how to do work in Rust based scenarios.
Closes #214 (closed)
Checklist
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You have read, and followed the guidance in, the CONTRIBUTING guide -
The MR content has run through a pipeline, or at least has pipelines enabled. -
There are no licence concerns with this contribution (The README clearly states Subplot is MIT-0)