Add mypy to pre-commit and improve typehints #98
+55
−39
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Closes #96
Adds mypy checks to pre-commit hooks.
Used RightTyper to help identify errors and the correct types, it was useful but not comprehensive as mypy still threw a lot of problems which have, mostly, been corrected. This was mainly as a precurrsor to addressing and correcting type hints in TopoStats.
There were a few areas where ignores have been added as I couldn't see how to correct these. They may want correcting in the modules, less important for the tests.