chore: unify style and fix spelling

Lars Kruserequested to merge
sumpfralle/aura-engine:lars-style into master
  • apply "black" formatting
  • apply "isort" adjustments
  • fix "flake8" issues
  • fix spelling issues
  • add CI job for style and spelling checks

The lint, style and spelling checks/actions are currently executed via a (very trivial) Makefile. These can be easily moved to a more suitable place.

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