Improved checkduplicates test and restructure project

[TabulateJarl8]

This is a pretty big pull request. Here's the list of changes:

• Rewrote the checkduplicates test in Rust using Wagner-Fischer, improving it's speed from ~400k it/s to ~1.4M it/s.
• Restructured the project to use poetry instead of setup.py
• Rewrite the tests in PyTest and put pytest-cov into place with 100% code coverage
• Removed some newly found duplicate facts and fixed some fact typos

[codecov-commenter]

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