Feat: Add CityObjectCollector visitor

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/CheckId.java

@@ -56,7 +56,7 @@ public record CheckId(String name) implements Serializable {
 	public static final CheckId C_GE_S_NOT_CLOSED = new CheckId("C_GE_S_NOT_CLOSED");
 	public static final CheckId C_GE_P_ORIENTATION_RINGS_SAME = new CheckId("C_GE_P_ORIENTATION_RINGS_SAME");
 	public static final CheckId C_SE_POLYGON_WITHOUT_SURFACE = new CheckId("C_SE_POLYGON_WITHOUT_SURFACE");
-
+	public static final CheckId UTIL_CITY_OBJECT_COLLECTOR = new CheckId("UTIL_CITY_OBJECT_COLLECTOR");
 
 	@Override
 	public boolean equals(Object obj) {

CityDoctorParent/CityDoctorValidation/src/main/java/de/hft/stuttgart/citydoctor2/checks/util/CityObjectCollector.java

+package de.hft.stuttgart.citydoctor2.checks.util;
+
+import de.hft.stuttgart.citydoctor2.check.Check;
+import de.hft.stuttgart.citydoctor2.check.CheckId;
+import de.hft.stuttgart.citydoctor2.check.Requirement;
+import de.hft.stuttgart.citydoctor2.check.RequirementType;
+import de.hft.stuttgart.citydoctor2.datastructure.CityObject;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+public class CityObjectCollector extends Check {
+
+    private final List<CityObject> objects = new ArrayList<>();
+
+    @Override
+    public Set<Requirement> appliesToRequirements() {
+        return Set.of();
+    }
+
+    @Override
+    public CheckId getCheckId() {
+        return CheckId.UTIL_CITY_OBJECT_COLLECTOR;
+    }
+
+    @Override
+    public RequirementType getType() {
+        return null;
+    }
+
+    @Override
+    public Check createNewInstance() {
+        return new CityObjectCollector();
+    }
+
+    @Override
+    public boolean isValidator() {
+        return false;
+    }
+
+    public List<CityObject> getCityObjects() {
+        return objects;
+    }
+
+    @Override
+    public void check(CityObject co) {
+        objects.add(co);
+    }
+}