workflow descriptors are now pydantic-based

[keighrim]

fixes #366

[codecov]

Codecov Report

❌ Patch coverage is 90.96045% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.76%. Comparing base (a6db461) to head (9ee0bd5).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
mmif/utils/workflow_helper.py	87.87%	12 Missing ⚠️
mmif/utils/cli/__init__.py	93.84%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #367      +/-   ##
===========================================
+ Coverage    71.66%   73.76%   +2.10%     
===========================================
  Files           22       22              
  Lines         2915     3023     +108     
===========================================
+ Hits          2089     2230     +141     
+ Misses         826      793      -33     

Flag	Coverage Δ
unittests	73.76% <90.96%> (+2.10%)	⬆️

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[marcverhagen]

Definitely looks better than before.