Add support for dask.

[tobiasraabe]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 72.52747% with 25 lines in your changes are missing coverage. Please review.

Project coverage is 90.95%. Comparing base (d3a7bdc) to head (3d6ed34).

Files	Patch %	Lines
src/pytask_parallel/dask.py	69.56%	14 Missing ⚠️
src/pytask_parallel/backends.py	61.53%	10 Missing ⚠️
src/pytask_parallel/config.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   94.17%   90.95%   -3.23%     
==========================================
  Files          16       17       +1     
  Lines         584      652      +68     
==========================================
+ Hits          550      593      +43     
- Misses         34       59      +25     

Flag	Coverage Δ
end_to_end	88.95% <72.52%> (-3.00%)	⬇️
unit	52.14% <50.54%> (+0.94%)	⬆️

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