Add isort to flake8 linting

[pyrco]

(DIS-1789)

[codecov]

Codecov Report

Merging #11 (a3151b5) into main (c640d15) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   40.71%   40.71%           
=======================================
  Files           9        9           
  Lines         953      953           
=======================================
  Hits          388      388           
  Misses        565      565           

Flag	Coverage Δ
unittests	40.71% <100.00%> (ø)

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

Impacted Files	Coverage Δ
dissect/cim/c_cim.py	100.00% <ø> (ø)
dissect/cim/classes.py	32.99% <ø> (ø)
dissect/cim/utils.py	36.00% <ø> (ø)
dissect/cim/__init__.py	100.00% <100.00%> (ø)
dissect/cim/cim.py	40.15% <100.00%> (ø)
dissect/cim/index.py	45.09% <100.00%> (ø)
dissect/cim/objects.py	30.13% <100.00%> (ø)

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