Add option for isort

[veit]

• isort
• Config:

  [isort]
  atomic=true
  force_grid_wrap=0
  include_trailing_comma=true
  lines_after_imports=2
  lines_between_types=1
  multi_line_output=3
  not_skip=__init__.py
  use_parentheses=true
  
  known_first_party=attr
  known_third_party=hypothesis,pytest,setuptools,six,zope
  

• For the detection of third party packages you can use seed-isort-config.