Raise error if paths are not correctly cased on case-insensitive Windows.

[tobiasraabe]

Changes

• An error is raised on Windows if the casing is wrong.
• No errors on case-insensitive macOS sinceI found no way and tested some approaches. Contributions welcome.
• On case-sensitive systems a hint is shown when nodes cannot be found.

[codecov]

Codecov Report

Merging #81 (258c488) into main (b6ae5f3) will decrease coverage by 0.29%.
The diff coverage is 73.75%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   90.36%   90.06%   -0.30%     
==========================================
  Files          58       58              
  Lines        4793     4863      +70     
==========================================
+ Hits         4331     4380      +49     
- Misses        462      483      +21     

Flag	Coverage Δ
end_to_end	76.70% <58.75%> (-0.33%)	⬇️
integration	41.76% <51.25%> (+0.12%)	⬆️
unit	67.57% <71.25%> (+0.13%)	⬆️

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Impacted Files	Coverage Δ
src/_pytask/path.py	87.87% <42.85%> (-12.13%)	⬇️
tests/test_path.py	83.78% <45.45%> (-16.22%)	⬇️
src/_pytask/collect.py	96.96% <76.92%> (-2.22%)	⬇️
tests/test_collect.py	91.02% <77.41%> (-8.98%)	⬇️
src/_pytask/nodes.py	96.91% <80.00%> (-0.61%)	⬇️
src/_pytask/config.py	97.59% <100.00%> (+0.18%)	⬆️
src/_pytask/resolve_dependencies.py	100.00% <100.00%> (ø)
tests/test_nodes.py	93.49% <100.00%> (ø)

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