Use pydantic

[lsbardel]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.90598% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.43%. Comparing base (a880efa) to head (b84ab30).

Files with missing lines	Patch %	Lines
metablock/spaces.py	82.40%	19 Missing ⚠️
metablock/orgs.py	69.04%	13 Missing ⚠️
metablock/client.py	81.25%	3 Missing ⚠️
metablock/utils.py	78.57%	3 Missing ⚠️
metablock/extensions.py	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   82.50%   83.43%   +0.93%     
==========================================
  Files           9        9              
  Lines         480      495      +15     
==========================================
+ Hits          396      413      +17     
+ Misses         84       82       -2     

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