add 提交流程变量vo

ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/domain/vo/VariableVo.java

@@ -0,0 +1,28 @@
+package org.dromara.workflow.domain.vo;
+
+import lombok.Data;
+
+import java.io.Serial;
+import java.io.Serializable;
+
+/**
+ * 流程变量
+ *
+ * @author may
+ */
+@Data
+public class VariableVo implements Serializable {
+
+    @Serial
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 变量key
+     */
+    private String key;
+
+    /**
+     * 变量值
+     */
+    private String value;
+}