feat: SQL implementation of TargetNodeDirectory

[bscholtes1A]

What this PR changes/adds

SQL implementation of TargetNodeDirectory.

Why it does that

Persistent implementation of TargetNodeDirectory.

Linked Issue(s)

Closes #240

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.75000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 76.25%. Comparing base (2d71ca0) to head (e20b1f1).
Report is 78 commits behind head on main.

Files	Patch %	Lines
.../edc/catalog/store/sql/SqlTargetNodeDirectory.java	89.74%	4 Missing ⚠️
...log/store/sql/SqlTargetNodeDirectoryExtension.java	88.88%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #241       +/-   ##
===========================================
+ Coverage   65.43%   76.25%   +10.81%     
===========================================
  Files          25       31        +6     
  Lines         434      657      +223     
  Branches       15       26       +11     
===========================================
+ Hits          284      501      +217     
- Misses        135      136        +1     
- Partials       15       20        +5     

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