Implement a conditional skip marker

[roecla]

Changes

Add a marker called skip_if that takes two arguments, a condition and a reason.
If the condition is True (or all conditions are True in case more than one skip_if marker is used) the task is skipped, else it is run normally.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Add test cases
• Register and implement the marker
• Test the marker in sid-germany.
• Add a tutorial explaining the two skip decorators.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #62 (54579fd) into main (9f02b8e) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   90.05%   90.17%   +0.11%     
==========================================
  Files          55       55              
  Lines        4596     4652      +56     
==========================================
+ Hits         4139     4195      +56     
  Misses        457      457              

Flag	Coverage Δ
end_to_end	76.13% <100.00%> (+0.29%)	⬆️
integration	41.59% <14.03%> (-0.36%)	⬇️
unit	68.14% <17.54%> (-0.64%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/_pytask/skipping.py	100.00% <100.00%> (ø)
tests/test_skipping.py	95.23% <100.00%> (+2.83%)	⬆️

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[tobiasraabe]

Hi Klara, the code is really well written, has tests and documentation! Thanks for great work. 🎉

And thanks for being the first contributor! 🎆

I added some comments to discuss some details. And could you add this PR to the Changes.rst as well as mentioning your handle with:ghuser:`roecla` ?

[asottile]

(sorry for drive-by) apologies for the slow pre-commit.ci run -- github gave us repeated 500s while trying to look up pull request information for this PR (and exhausted our retries). I've requeued it and it looks like it succeeded now.

[tobiasraabe]

That is quite a suprise :). Thanks for stopping by and while you are here, thanks for pre-commit. A minor hiccup is nothing I think too long about given the tremendous benefits I get from the tool.