Implementing missing fields from Structure

[Lattay]

Implementing fields added here: Materials-Consortia/OPTIMADE#555

• fractional_site_positions
• optimization_type
• site_coordinate_span
• site_coordinate_span_description

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.35%. Comparing base (bc3439a) to head (7f9d5a8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2418      +/-   ##
==========================================
+ Coverage   90.28%   90.35%   +0.07%     
==========================================
  Files          78       78              
  Lines        5086     5093       +7     
==========================================
+ Hits         4592     4602      +10     
+ Misses        494      491       -3     

Flag	Coverage Δ
project	90.35% <100.00%> (+0.07%)	⬆️
validator	90.35% <100.00%> (+0.07%)	⬆️

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