Run Flake8 during CI

[mdekstrand]

[codecov[bot]]

Codecov Report

Patch coverage: 96.77% and project coverage change: +0.32 :tada:

Comparison is base (99dca1a) 94.76% compared to head (51536ad) 95.08%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   94.76%   95.08%   +0.32%     
==========================================
  Files          19       19              
  Lines        1185     1181       -4     
==========================================
  Hits         1123     1123              
+ Misses         62       58       -4     

Impacted Files	Coverage Δ
csr/kernels/mkl/_api.py	100.00% <ø> (ø)
csr/kernels/mkl/handle.py	91.48% <ø> (-0.18%)	:arrow_down:
csr/csr.py	96.71% <95.23%> (+1.30%)	:arrow_up:
csr/kernels/__init__.py	93.54% <100.00%> (ø)
csr/kernels/mkl/__init__.py	100.00% <100.00%> (ø)
csr/kernels/mkl/multiply.py	100.00% <100.00%> (ø)
csr/kernels/numba/multiply.py	100.00% <100.00%> (ø)
csr/structure.py	99.37% <100.00%> (ø)
csr/test_utils.py	95.06% <100.00%> (ø)

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