rewrite it in rust baby

[sneakers-the-rat]

builds on top of #231, so swap bases once that's done.

i'll write more later but i'm learning a lot abt rust here, opening as a draft to just track progress.

goal is to rewrite the scheduler and topo sorter in rust, the rest is still gonna be python but we have juiced as much perf as we can out of this thing and still need it faster. just the toposorter done so far since it was pretty mechanical, doing the scheduler will take a bit of time bc idk how the python/rust boundary works yet exactly/the best way to do that. but topo sorter is already roughly twice as fast with no optimizations and using a p inefficient data structure for what we need.

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📚 Documentation preview 📚: https://noob--243.org.readthedocs.build/en/243/

[coveralls]

Coverage is 84.658% — noob-core into consolidate-zmq-scheduling. No base build found for consolidate-zmq-scheduling.