add fancy completion using argcomplete

[maurerle]

While watching an interesting talk about tab-completion I tried to set this up for assume too.

Screencast.from.2023-11-12.14-46-15.webm

This suggests possible database paths and scenarios, as well as parameters for case_study based on the context.
By moving the script to the top folder, assume does not need to be imported if only calling the --help for example.

This should also work on macOS by running:

pip install -e .
eval "$(register-python-argcomplete assume)"

And also for Powershell on Windows using:

register-python-argcomplete --shell powershell assume | Out-String | Invoke-Expression (though I did not test it)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (53c7563) 78.28% compared to head (fa4234e) 78.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   78.28%   78.23%   -0.05%     
==========================================
  Files          40       39       -1     
  Lines        4242     4214      -28     
==========================================
- Hits         3321     3297      -24     
+ Misses        921      917       -4     

Flag	Coverage Δ
pytest	78.23% <100.00%> (-0.05%)	⬇️

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Files	Coverage Δ
assume/common/scenario_loader.py	88.83% <100.00%> (+0.05%)	⬆️
assume/world.py	82.35% <100.00%> (ø)

... and 1 file with indirect coverage changes

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