Add Termcode and Terminology to children, parents and related items:

[Frontman50]

Common:

• add Termcode and Terminology to RelationalTermcode dataclass
• adapt new structure in ontology_index.json for es Tests:
• add new structure to json schema files

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.32%. Comparing base (bc34dfc) to head (fe6a14f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #373      +/-   ##
==========================================
+ Coverage   57.30%   57.32%   +0.02%     
==========================================
  Files          45       45              
  Lines        3574     3576       +2     
  Branches      517      517              
==========================================
+ Hits         2048     2050       +2     
  Misses       1396     1396              
  Partials      130      130              

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