Add isort to flake8 linting

[pyrco]

(DIS-1789)

[codecov]

Codecov Report

Merging #26 (09eb1fc) into main (728bfdc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #26   +/-   ##
=======================================
  Coverage   88.03%   88.03%           
=======================================
  Files          20       20           
  Lines        1696     1696           
=======================================
  Hits         1493     1493           
  Misses        203      203           

Flag	Coverage Δ
unittests	88.03% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dissect/cstruct/cstruct.py	89.74% <ø> (ø)
dissect/cstruct/__init__.py	100.00% <100.00%> (ø)
dissect/cstruct/bitbuffer.py	94.11% <100.00%> (ø)
dissect/cstruct/types/base.py	84.76% <100.00%> (ø)
dissect/cstruct/types/chartype.py	94.59% <100.00%> (ø)
dissect/cstruct/types/enum.py	94.20% <100.00%> (ø)
dissect/cstruct/types/packedtype.py	94.73% <100.00%> (ø)
dissect/cstruct/types/pointer.py	90.24% <100.00%> (ø)
dissect/cstruct/types/structure.py	91.58% <100.00%> (ø)
dissect/cstruct/utils.py	92.75% <100.00%> (ø)

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