Update model processing

[timmens]

In this PR, I update the model processing. I mainly focus on the following things:

• Adding type hints to process_model.py
• Improving the user interface through user Model dataclass which adds autocompletion and error handling at the creation of the user model
• Improving the user interface through grid dataclass that add autocompletion and error handling at the grid creation time.
  • Implement DiscreteGrid, LinspaceGrid, LogspaceGrid, which inherit from baseclass Grid, and ContinuousGrid.
• Update create_params_template.py
• Remove black formatter and replace by ruff-formatter (this also means we can remove nbqa)

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[hmgaudecker]

Thanks a lot, that is much nicer to read now!

This clarity reveals some parts that could use high-level improvements -- ofc I did not follow instructions in that respect and noted them. Feel free to push off to some issue wherever you think that is more useful, though! Or, of course, tell me that this or that comment is nonsense.

[hmgaudecker]

Excellent work, many thanks!