Added a toString to UnwrappedEdgeCollection

[oxisto]

Fixes #2030

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.23%. Comparing base (fe3a1f2) to head (fc6e811).
Report is 1 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
...graph/edges/collections/UnwrappedEdgeCollection.kt	83.33% <100.00%> (+0.72%)	⬆️

... and 3 files with indirect coverage changes

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