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feat: Extend GPX conversion functions to support Polygon output

• Updated trkToMultiLineStringOrPolygon to convert GPX track segments to GeoJSON Polygons when segments are closed loops, or MultiLineStrings otherwise.
• Updated rteToLineStringOrPolygon to convert GPX route nodes to GeoJSON Polygons if they're closed loops, or LineStrings otherwise.
• Added utility function areCoordsSame to compare coordinate arrays for equality, facilitating the determination of closed loops.
• Enhanced code documentation to reflect changes and clarify function behaviors.