style: Enforce type annotations

[Oliver Borchert (borchero)]

Motivation

I think that it's generally good practice to enforce type annotations. This PR largely adds explicit -> None return annotations.

Changes

• Set disallow_untyped_defs = true in the mypy options

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3cfe686) to head (9990d6a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #7   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           36        36           
  Lines         1776      1776           
=========================================
  Hits          1776      1776           

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[Daniel Elsner (delsner)]

Thanks!