Add schemathesis tests

[DanLipsitt]

This PR adds automated Schemathesis tests to the test suite. Most of the tests currently fail, and I believe this is due to a bug in Schemathesis, described in schemathesis/schemathesis#1335. I see that the author of Schemathesis has kindly offered to help get it working with fastapi-crudrouter. I'll update the schemathesis ticket and hopefully this PR will help both projects.

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[DanLipsitt]

Current CI failure seems to be due to a bug in pytest 7.0.0 (pytest-dev/pytest#9609). Run tests again when 7.0.1 is out (should be very soon) or work around it in dev.requirements.txt.

[DanLipsitt]

I added the pytest workaround. Any remaining failures should be due to the Schemathesis bug mentioned above.

[awtkns]

Thanks for this @DanLipsitt, great work! 🚀

[Stranger6667]

Thank you so much @DanLipsitt for bringing this PR and reporting the issue to Schemathesis! @awtkns thank you for reviewing & approving the changes :)

I added a small suggestion in the comment above which makes the tests work. They took quite some time to run on my machine (~7 minutes) but showed quite a lot of things that might require attention. I'd also suggest adding data_generation_methods=schemathesis.DataGenerationMethod.all() to schemathsis.from_dict so it also executes negative test scenarios, however they are even slower.

Let me know if I can help with anything :) I'd be happy elaborate

[DanLipsitt]

Updated per @Stranger6667's suggestion.

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