Add rudimentary typing to pytask.

[tobiasraabe]

Changes

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[codecov]

Codecov Report

Merging #160 (730acde) into main (66e9483) will decrease coverage by 0.49%.
The diff coverage is 89.39%.

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
- Coverage   93.33%   92.84%   -0.50%     
==========================================
  Files          69       69              
  Lines        6015     6272     +257     
==========================================
+ Hits         5614     5823     +209     
- Misses        401      449      +48     

Flag	Coverage Δ
end_to_end	77.10% <88.10%> (+0.09%)	⬆️
integration	41.54% <81.08%> (+1.49%)	⬆️
unit	70.53% <86.96%> (+0.46%)	⬆️

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Impacted Files	Coverage Δ
tests/test_dag.py	96.62% <25.00%> (-1.08%)	⬇️
tests/test_nodes.py	92.12% <25.00%> (-1.37%)	⬇️
src/_pytask/logging.py	90.00% <65.21%> (-7.65%)	⬇️
src/_pytask/capture.py	85.81% <69.44%> (-0.78%)	⬇️
src/_pytask/persist.py	91.17% <70.00%> (-8.83%)	⬇️
src/_pytask/mark_utils.py	83.33% <77.77%> (-16.67%)	⬇️
src/_pytask/skipping.py	95.58% <78.57%> (-4.42%)	⬇️
src/_pytask/debugging.py	33.46% <80.00%> (+3.29%)	⬆️
src/_pytask/mark/expression.py	97.58% <80.00%> (-0.77%)	⬇️
src/_pytask/clean.py	90.97% <86.11%> (-1.22%)	⬇️
... and 30 more

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