fix: keep RealPath as top-level, use FullPath and utility functions FullNestedPath, LocalPath, Path

Signed-off-by: Keith Zantow <kzantow@gmail.com>

syft/pkg/cataloger/binary/classifier_cataloger_test.go

@@ -3410,9 +3410,7 @@ func match(classifier string, paths ...string) pkg.ClassifierMatch {
 	return pkg.ClassifierMatch{
 		Classifier: classifier,
 		Location: file.NewVirtualLocationFromCoordinates(
-			file.Coordinates{
-				RealPath: realPath,
-			},
+			file.NewCoordinates(realPath, ""),
 			virtualPath,
 		),
 	}