`ExcelProperty`新增`order` 用于排序

src/test/java/com/alibaba/easyexcel/test/core/sort/SortData.java

@@ -9,13 +9,12 @@ import lombok.Data;
  */
 @Data
 public class SortData {
-
     private String column5;
     private String column6;
-    @ExcelProperty(order = 99)
-    private String column3;
     @ExcelProperty(order = 100)
     private String column4;
+    @ExcelProperty(order = 99)
+    private String column3;
     @ExcelProperty(value = "column2", index = 1)
     private String column2;
     @ExcelProperty(value = "column1", index = 0)