## What is the purpose of the change
Once we are going to extend the serialization, write direct to Hessian
InputStream/OutputStream is high efficient on the memroy.
## Brief changelog
Currently, the InputStream/OutputStream is not exported. The change is going to
export the InputStream/OutputStream from Hessian2ObjectInput and
Hessian2ObjectOutput.
```
private final Hessian2ObjectOutput delegate;
protected ProtobufObjectOutput(OutputStream os) {
this.delegate = new Hessian2ObjectOutput(os);
}
void writeBytesForPBObject(Object obj, Class clazz) throws IOException {
try (OutputStream os = delegate.getOutputStream()) {
if (obj instanceof MessageLite) {
try {
((MessageLite) obj).writeTo(os);
} catch (IOException e) {
throw new RuntimeException("Google PB序列化失败，序列化对象的类型为" +
obj.getClass().getName(), e);
}
}
}
}
```
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[ Full content available at: https://github.com/apache/dubbo/pull/5780 ]
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