Improve path deduplication

[tzaeschke]

Currently, the path resolver may returns multiple paths (only for shortcuts) that differ only in segment ID/MAC/expiration date but have identical IF IDs.
Instead we should retiurn one the one that ensures the maximum validity.

[codecov]

Codecov Report

Attention: Patch coverage is 87.69231% with 8 lines in your changes missing coverage. Please review.

Files	Patch %	Lines
...org/scion/jpan/internal/PathDuplicationFilter.java	80.95%	5 Missing and 3 partials ⚠️

Files	Coverage Δ	Complexity Δ
...va/org/scion/jpan/internal/PathRawParserLight.java	100.00% <100.00%> (ø)	8.00 <8.00> (?)
...rc/main/java/org/scion/jpan/internal/Segments.java	85.58% <100.00%> (+1.10%)	96.00 <0.00> (-3.00)	⬆️
...org/scion/jpan/internal/PathDuplicationFilter.java	80.95% <80.95%> (ø)	9.00 <9.00> (?)