optimize: use curator instead of zkclient in config model

config/seata-config-core/src/main/java/org/apache/seata/config/ConfigurationChangeEvent.java

@@ -141,4 +141,15 @@ public ConfigurationChangeEvent setNamespace(String namespace) {
         this.namespace = namespace;
         return this;
     }
+
+    @Override
+    public String toString() {
+        return "ConfigurationChangeEvent{" +
+            "dataId='" + dataId + '\'' +
+            ", oldValue='" + oldValue + '\'' +
+            ", newValue='" + newValue + '\'' +
+            ", namespace='" + namespace + '\'' +
+            ", changeType=" + changeType +
+            '}';
+    }
 }

config/seata-config-zk/pom.xml

@@ -45,6 +45,14 @@
                 </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>org.apache.curator</groupId>
+            <artifactId>curator-recipes</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.curator</groupId>
+            <artifactId>curator-framework</artifactId>
+        </dependency>
     </dependencies>
 
 </project>