Add metadata to attribute in DeviceMeasurementBuilder

The updated code adds a metadata list to the attribute in the DeviceMeasurementBuilder class. This is achieved by setting the metadata to the attribute of deviceMeasurement. The change enhances the flexibility of the attribute, allowing it to contain more information about the DeviceMeasurement.

src/main/java/de/app/fivegla/fiware/model/builder/DeviceMeasurementBuilder.java

@@ -7,6 +7,7 @@
 import de.app.fivegla.fiware.model.generic.Metadata;
 
 import java.time.Instant;
+import java.util.List;
 
 /**
  * The DeviceMeasurementBuilder class is responsible for building instances of the DeviceMeasurement class.
@@ -69,6 +70,7 @@ public DeviceMeasurementBuilder withMeasurement(String name, String type, String
         metadata.setName("dateObserved");
         metadata.setType(FiwareTypes.DATE_TIME.getKey());
         metadata.setValue(dateObserved.toString());
+        attribute.setMetadata(List.of(metadata));
         deviceMeasurement.setMeasurement(attribute);
         return this;
     }