#355, #401: Introduce isort and gitlab-ci-linter pre-commit hooks

Moulrequested to merge
401_isort_gitlab_ci into dev
  • Add isort as dev dependency
  • Sort imports in silkaj and tests folders
  • Add pre-commit hook
  • Set Py 3.8 as default image
  • Add isort job:
    • Install isort on Py3.8 image
  • Introduce gitlab-ci-linter pre-commit hook

Close #401 (closed).

Edited by Moul

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