Add support for space_group_symmetry_operations_xyz

[ml-evs]

As above. Adds the OPTIMADE 1.2 field space_group_symmetry_operations_xyz, superseding #1422.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.58%. Comparing base (e171370) to head (e86fcd4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
optimade/models/structures.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2236      +/-   ##
==========================================
+ Coverage   90.57%   90.58%   +0.01%     
==========================================
  Files          75       75              
  Lines        4889     4899      +10     
==========================================
+ Hits         4428     4438      +10     
  Misses        461      461              

Flag	Coverage Δ
project	90.58% <90.90%> (+0.01%)	⬆️
validator	90.58% <90.90%> (+0.01%)	⬆️

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