Add Python 3.10, 3.11, 3.12 compatibility

[mhabedank]

This PR tries to solve the dependency problems we have when going forward to modern Python version.

Things currently done:

• moved from outdated build system and requirements files to hatch and pyproject.toml
• removed torchtext, rewrote lots of tokenizer code.
• removed importlib
• bumped numpy, torch, scikit-learn and several other dependencies.

[github-actions[bot]]

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Results for commit 01533ef7.

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