feat: migrate to nox, run tests in parallel, revamp test infra
#97
| Job | Run time |
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| 26s | |
| 26s | |
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| 32s | |
| 13m 27s | |
| 13m 26s | |
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| 35s | |
| 18s | |
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| 42s | |
| 47s | |
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| 44s | |
| 34m 55s |