feat:support instance detect trigger change listeners. (#614)

Author: SkyeBeFreeman

polaris-plugins/polaris-plugins-registry/registry-memory/src/main/java/com/tencent/polaris/plugins/registry/memory/InMemoryRegistry.java

@@ -371,6 +371,7 @@ public void updateInstances(ServiceUpdateRequest request) {
                 switch (entry.getKey()) {
                     case InstanceProperty.PROPERTY_DETECT_RESULT:
                         instanceLocalValue.setDetectResult((DetectResult) entry.getValue());
+                        changed = true;
                         break;
                     default:
                         break;