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Adds GeoJson.union(with:) for pair-wise polygon union and FeatureCollection.union() for batch union. Handles contained and disjoint polygons; returns Polygon or MultiPolygon.
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Summary
Implemented polygon union operations.
Sources/GISTools/Algorithms/Union.swiftGeoJson.union(with:) -> GeoJsonGeometry?— union of two polygon geometriesFeatureCollection.union() -> Feature?— union of all polygon featuresPolygonfor contiguous,MultiPolygonfor disjoint resultnilfor non-polygon inputsTests/UnionTests.swift(6 tests)unionDisjointPolygonsunionContainedPolygonunionFeatureCollectionunionFeatureWrappingunionNotPolygonunionEmptyREADME
Updated
unionfrom TODO.Test results
272 tests pass across 60 suites (+6 new).
Closes #24