fix: add stateTimestamp to translation model

[paullatzelsperger]

What this PR changes/adds

adds the stateTimestamp to the translation model for stateful entities (StatefulEntityMapping).

Why it does that

sorting stateful entities by stateTimestamp threw an IllegalArgumentException, because the translation model did not
contain a corresponding mapping.

Further notes

List other areas of code that have changed but are not necessarily linked to the main feature. This could be method
signature changes, package declarations, bugs that were encountered and were fixed inline, etc.

Linked Issue(s)

Closes # <-- insert Issue number if one exists

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.01%. Comparing base (7f20ba5) to head (cdb7c29).
Report is 247 commits behind head on main.

Files	Patch %	Lines
...g/eclipse/edc/sql/lease/StatefulEntityMapping.java	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4165      +/-   ##
==========================================
+ Coverage   71.74%   75.01%   +3.27%     
==========================================
  Files         919     1007      +88     
  Lines       18457    20454    +1997     
  Branches     1037     1151     +114     
==========================================
+ Hits        13242    15344    +2102     
+ Misses       4756     4609     -147     
- Partials      459      501      +42     

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