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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.42%. Comparing base (64fa42a) to head (aa8751c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2586      +/-   ##
==========================================
- Coverage   99.42%   99.42%   -0.01%     
==========================================
  Files          41       41              
  Lines        3149     3145       -4     
  Branches      682      682              
==========================================
- Hits         3131     3127       -4     
  Misses         11       11              
  Partials        7        7              

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