build: Remove mmh3 dependency

[julian-risch]

Related Issues

• fixes Remove mmh3 dependency #4847

Proposed Changes:

• Removed mmh3 dependency and added a python implementation of the only function we use from mmh3
• Hash value remains the same as before with mmh3 (new unit test)

How did you test it?

• Added new unit test
• https://colab.research.google.com/drive/1Xzp5UjNObEGE56ORRrPdAEqiqMD8CooG#scrollTo=MVr9_Xfj263P
• Tested x64 but not x86

Notes for the reviewer

Speed is as expected one to two orders of magnitude slower but it's not the bottleneck anyway. Calculating embeddings is much slower. We shouldn't optimize hashing speed here but get rid of the dependency instead.
You can already do the review despite the failing code coverage checks.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added tests that demonstrate the correct behavior of the change
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Coverage: 38.539% (+0.3%) from 38.239% when pulling 9ea7c3c on remove-mmh3 into 9d52998 on main.

[ZanSara]

Great!