Add support for v1.2 property definitions

[ml-evs]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 95.18414% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.66%. Comparing base (5ad3b5d) to head (b22fae0).

Files with missing lines	Patch %	Lines
optimade/models/property_definitions.py	95.86%	10 Missing ⚠️
optimade/server/schemas.py	91.04%	6 Missing ⚠️
optimade/validator/validator.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2442      +/-   ##
==========================================
+ Coverage   90.35%   90.66%   +0.31%     
==========================================
  Files          78       79       +1     
  Lines        5120     5464     +344     
==========================================
+ Hits         4626     4954     +328     
- Misses        494      510      +16     

Flag	Coverage Δ
project	90.66% <95.18%> (+0.31%)	⬆️
validator	90.66% <95.18%> (+0.31%)	⬆️

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