Add hashing to avoid reexecuting tasks when modification times changed.

[tobiasraabe]

Closes #344.

[codecov]

Codecov Report

Merging #357 (eb48884) into main (a4c1b75) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head eb48884 differs from pull request most recent head 319ce02. Consider uploading reports for the commit 319ce02 to get more accurate results

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
+ Coverage   96.11%   96.12%   +0.01%     
==========================================
  Files          94       94              
  Lines        7625     7646      +21     
==========================================
+ Hits         7329     7350      +21     
  Misses        296      296              

Flag	Coverage Δ
end_to_end	83.28% <100.00%> (-0.02%)	⬇️
integration	41.40% <17.02%> (-0.05%)	⬇️
unit	65.81% <46.80%> (+0.14%)	⬆️

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Impacted Files	Coverage Δ
src/_pytask/dag.py	99.43% <100.00%> (+0.02%)	⬆️
src/_pytask/database_utils.py	100.00% <100.00%> (ø)
src/_pytask/report.py	100.00% <100.00%> (ø)
tests/test_database.py	100.00% <100.00%> (ø)
tests/test_dry_run.py	100.00% <100.00%> (ø)
tests/test_execute.py	100.00% <100.00%> (ø)
tests/test_persist.py	100.00% <100.00%> (ø)

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