fix(process): 修复自定义配置 required 不生效

app/flow/nodes/ProcessNodeInterface.php

@@ -31,6 +31,10 @@ interface ProcessNodeInterface
      */
     public function handle(ProcessContext $context): ProcessContext;
 
+
+    public function getChildNodes(): array;
+    public function getChildNodeCount(): int;
+
     /**
      * 获取节点名称
      * @return string