Prevent recursive attr->dict conversion of FunctionTask inputs

[tclose]

Acknowledgment

• [ x ] I acknowledge that this contribution will be available under the Apache 2 license.

Types of changes

• [ x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Sets recurse=False in all calls to attr.asdict to allow "attrs" classes to be passed as
task inputs (which are otherwise also converted to dicts.

Checklist

• [ x ] All tests passing
• [ x ] I have added tests to cover my changes
• [ n/a ] I have updated documentation (if necessary)
• [ x ] My code follows the code style of this project
  (we are using black: you can pip install pre-commit,
  run pre-commit install in the pydra directory
  and black will be run automatically with each commit)

[codecov]

Codecov Report

Merging #503 (e61f2cb) into master (eb70454) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #503   +/-   ##
=======================================
  Coverage   83.04%   83.04%           
=======================================
  Files          20       20           
  Lines        4046     4046           
  Branches     1118     1118           
=======================================
  Hits         3360     3360           
  Misses        491      491           
  Partials      195      195           

Flag	Coverage Δ
unittests	82.97% <100.00%> (ø)

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

Impacted Files	Coverage Δ
pydra/engine/audit.py	88.88% <100.00%> (ø)
pydra/engine/core.py	89.28% <100.00%> (ø)
pydra/engine/helpers.py	79.57% <100.00%> (ø)
pydra/engine/helpers_file.py	80.48% <100.00%> (ø)
pydra/engine/helpers_state.py	90.00% <100.00%> (ø)
pydra/engine/specs.py	88.13% <100.00%> (ø)
pydra/engine/task.py	87.85% <100.00%> (ø)

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[djarecka]

lgtm, didn't think about it.

planning to add anything more? if not, we can merge it

[tclose]

No, that is all for this PR (I have already done a global search and replace for asdict). Please go ahead with the merge :)