Compile with mypyc

[DanielNoord]

Closes #1953

Tested this against pylint and I can run the compiled version of isort against it.
However, there doesn't seem to be a significant speed gain unfortunately.

Tests are also an issue, but that can come later.

[DanielNoord]

Blocked on mypyc/mypyc#1204

Without it we can't use the default_factory=dict in our settings I think.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.26%. Comparing base (55f06c5) to head (6aadf47).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2586      +/-   ##
==========================================
- Coverage   99.39%   99.26%   -0.14%     
==========================================
  Files          41       41              
  Lines        3156     3136      -20     
  Branches      682      682              
==========================================
- Hits         3137     3113      -24     
- Misses         11       13       +2     
- Partials        8       10       +2     

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[DanielNoord]

CI passes now :)

We'll need a release from mypy to be able to publish wheels to PyPI but this is a nice step towards getting this into the hands of users :)