producer send msg timeout option does not take effect

**BUG REPORT**  
1. Please describe the issue you observed:
## What is the purpose of the change

producer send msg timeout option does not take effect
```
rocketmq.NewProducer(
    producer.WithSendMsgTimeout(time.Second*3),
    producer.WithRetry(2),
)
```

In most cases, a fixed timeout of 3 seconds is written into the code, preventing the configuration from taking effect.
