Use functools.wraps in task decorator

[tclose]

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Summary

Ensures that the function name, location and docs of function tasks are not lost by the pydra.mark.task decorator

Checklist

• I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Merging #533 (418eca7) into master (92bc8c3) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #533      +/-   ##
==========================================
+ Coverage   76.84%   76.85%   +0.01%     
==========================================
  Files          20       20              
  Lines        4284     4286       +2     
  Branches     1211     1211              
==========================================
+ Hits         3292     3294       +2     
  Misses        805      805              
  Partials      187      187              

Flag	Coverage Δ
unittests	76.76% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
pydra/mark/functions.py	100.00% <100.00%> (ø)

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[effigies]

LGTM