Circular imports due to autopep8 formatting in digital device twins

[TomTomRixRix]

Describe the bug
Autopep8 is moving relative imports to top in `digital_device_twins/init.py which results in circular imports.

Specify a priority (low, medium, high)
high

To Reproduce
Steps to reproduce the behavior:

1. Setup python
2. Setup virtual environment
3. Install SIMPA from most recent develop branch
4. Run pre-commit hook to trigger autopep8 formatting, pre-commit install and bash .git/hooks/pre-commit
5. Run SIMPA script, for example simpa_examples/minimal_optical_example.py
6. See circular import error

Current Behavior
Results in circular import error

Expected behavior
Runs example without errors