fix: serialize the leftOperand as an @id

[wolf4ood]

What this PR changes/adds

serialize the leftOperand of a constraint as an @id

The breaking change only affects management API, since at protocol level EDC in input can handle both @value and @id as expanded form

Linked Issue(s)

Closes #4179

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.04%. Comparing base (7f20ba5) to head (b11b852).
Report is 255 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4185      +/-   ##
==========================================
+ Coverage   71.74%   75.04%   +3.29%     
==========================================
  Files         919     1012      +93     
  Lines       18457    20548    +2091     
  Branches     1037     1160     +123     
==========================================
+ Hits        13242    15420    +2178     
+ Misses       4756     4620     -136     
- Partials      459      508      +49     

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