Add method to retrieve specific component health statuses.

Signed-off-by: Yufei Cai <Yufei.Cai@bosch-si.com>

services/utils/health/src/main/java/org/eclipse/ditto/services/utils/health/Health.java

@@ -15,6 +15,7 @@
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 
 import org.eclipse.ditto.json.JsonFactory;
 import org.eclipse.ditto.json.JsonObject;
@@ -53,6 +54,16 @@ public HealthStatus getOverallStatus() {
         return overallStatus;
     }
 
+    /**
+     * Returns the health status of a component if it exists.
+     *
+     * @param componentName name of the component.
+     * @return status of the component if it exists, or an empty optional otherwise.
+     */
+    public Optional<HealthStatus> getComponentStatus(final String componentName) {
+        return Optional.ofNullable(componentStatuses.get(componentName));
+    }
+
     /**
      * Returns an empty builder.
      *