add region created event and handle it to cal region capacity immediately

kafka-manager-common/src/main/java/com/xiaojukeji/kafka/manager/common/events/RegionCreatedEvent.java

@@ -0,0 +1,20 @@
+package com.xiaojukeji.kafka.manager.common.events;
+
+import com.xiaojukeji.kafka.manager.common.entity.pojo.RegionDO;
+import lombok.Getter;
+import org.springframework.context.ApplicationEvent;
+
+/**
+ * Region创建事件
+ * @author zengqiao
+ * @date 22/01/1
+ */
+@Getter
+public class RegionCreatedEvent extends ApplicationEvent {
+    private final RegionDO regionDO;
+
+    public RegionCreatedEvent(Object source, RegionDO regionDO) {
+        super(source);
+        this.regionDO = regionDO;
+    }
+}