Add datalad task

[yibeichan]

Types of changes

• New feature (non-breaking change which adds functionality)

Summary

as discussed with @djarecka, add datalad interface (adopted from mriqc) to pydra task

Checklist

• I have added tests to cover my changes
  but the test didn't pass locally, got an error TypeError: __init__() missing 1 required positional argument: 'func'; will discuss with Dorota through meeting
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Base: 81.16% // Head: 80.87% // Decreases project coverage by -0.28% ⚠️

Coverage data is based on head (5d5a154) compared to base (c2cc452).
Patch coverage: 64.61% of modified lines in pull request are covered.

❗ Current head 5d5a154 differs from pull request most recent head edac2c8. Consider uploading reports for the commit edac2c8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #594      +/-   ##
==========================================
- Coverage   81.16%   80.87%   -0.29%     
==========================================
  Files          20       21       +1     
  Lines        4391     4456      +65     
  Branches     1262        0    -1262     
==========================================
+ Hits         3564     3604      +40     
- Misses        823      852      +29     
+ Partials        4        0       -4     

Flag	Coverage Δ
unittests	80.87% <64.61%> (-0.29%)	⬇️

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

Impacted Files	Coverage Δ
pydra/tasks/datalad.py	64.61% <64.61%> (ø)
pydra/engine/task.py	93.23% <0.00%> (-0.31%)	⬇️
pydra/engine/core.py	92.96% <0.00%> (-0.16%)	⬇️
pydra/engine/helpers.py	86.05% <0.00%> (ø)
pydra/engine/workers.py	18.76% <0.00%> (ø)

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