Implement a dry-run mode.

[tobiasraabe]

Changes

Closes #251.

[codecov]

Codecov Report

Merging #290 (002976e) into main (cf478a7) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 002976e differs from pull request most recent head 22dc824. Consider uploading reports for the commit 22dc824 to get more accurate results

@@            Coverage Diff             @@
##             main     #290      +/-   ##
==========================================
+ Coverage   96.63%   96.67%   +0.04%     
==========================================
  Files          90       91       +1     
  Lines        7671     7765      +94     
==========================================
+ Hits         7413     7507      +94     
  Misses        258      258              

Flag	Coverage Δ
end_to_end	82.78% <100.00%> (+0.21%)	⬆️
integration	40.88% <24.27%> (-0.19%)	⬇️
unit	68.65% <34.95%> (-0.47%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/build.py	100.00% <100.00%> (ø)
src/_pytask/config.py	98.19% <100.00%> (+0.01%)	⬆️
src/_pytask/execute.py	96.80% <100.00%> (+0.21%)	⬆️
src/_pytask/outcomes.py	95.89% <100.00%> (+0.11%)	⬆️
src/_pytask/skipping.py	100.00% <100.00%> (ø)
tests/test_dry_run.py	100.00% <100.00%> (ø)

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