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.