java.sql.Timestamp序列化丢失类型

### 问题描述
java.sql.Timestamp类型序列化时，使用JSONWriter.Feature.WriteClassName依然会丢失类型，反序列化后认为是字符串，但“java.util.Date"不会，从序列化的字符串来看，“java.util.Date"有特殊处理，java.sql.Timestamp没有？

### 环境信息
*请填写以下信息：*

- OS信息： Mac
- JDK信息：jdk17
- 版本信息：Fastjson2 2.0.51

### 重现步骤

```java
String timestampOut = JSON.toJSONString(new java.sql.Timestamp(new Date().getTime()),
JSONWriter.Feature.WriteClassName);
System.out.println(JSON.parseObject(timestampOut, Object.class).getClass());

String dateOut = JSON.toJSONString(new Date(), JSONWriter.Feature.WriteClassName);
System.out.println(JSON.parseObject(dateOut, Object.class).getClass());
```

### 期待的正确结果
timestampOut的输出为“class java.sql.Timestamp”，现在的输出的是“class java.lang.String”

Start with the supplied JSON.toJSONString and JSON.parseObject reproduction using java.sql.Timestamp, java.util.Date, and JSONWriter.Feature.WriteClassName. Compare the serialization and deserialization paths for both types; done means the Timestamp example reports class java.sql.Timestamp while the Date example continues to work.

Written by the indexing model from the issue text.