dubbo服务中，内部异常ForestNetworkException会直接导致序列化崩溃

```
java.lang.RuntimeException: Serialized class com.dtflys.forest.backend.okhttp3.response.OkHttp3ForestResponse must implement java.io.Serializable
Java field: private com.dtflys.forest.http.ForestResponse com.dtflys.forest.exceptions.ForestNetworkException.response
Java field: private java.lang.Throwable java.lang.Throwable.cause
```
原因是`ForestNetworkException`类有一个字段`ForestResponse`， 而`ForestResponse`没有实现`Serializable`接口

```java
public class ForestNetworkException extends ForestRuntimeException {

private Integer statusCode;

private ForestResponse response;

public ForestNetworkException(String message, Integer statusCode, ForestResponse response) {
super(errorMessage(message, statusCode, response));
this.statusCode = statusCode;
this.response = response;
}
// ...some other...
}
```