[FIX] Enable Workflow constructor to receive SpecInfo objects for input_spec parameter

[NicolasGensollen]

Fixes #572

Types of changes

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

Summary

This PR adds the possibility to pass an instance of SpecInfo to the Workflow constructor as is already documented. Prior to this PR, passing such input was triggering a TypeError (see #572).

Checklist

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

[codecov]

Codecov Report

Base: 77.06% // Head: 77.08% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (0c77ad5) compared to base (219c721).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
+ Coverage   77.06%   77.08%   +0.02%     
==========================================
  Files          20       20              
  Lines        4316     4320       +4     
  Branches     1213     1215       +2     
==========================================
+ Hits         3326     3330       +4     
  Misses        802      802              
  Partials      188      188              

Flag	Coverage Δ
unittests	76.99% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
pydra/engine/core.py	89.04% <100.00%> (+0.06%)	⬆️

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