[Enhancement✨] DefaultMQProducer#set_produce_accumulator to always wrap dispatcher in Some and remove Option parameter

### Current Behavior

<img width="1144" height="577" alt="Image" src="https://github.com/user-attachments/assets/26032860-f0af-46f9-a137-4b115e801f44" />

### Proposed Enhancement

<img width="1241" height="490" alt="Image" src="https://github.com/user-attachments/assets/5993555a-94ac-4e86-be05-12f4dae929f3" />

### Benefits

_No response_

### Additional Context

_No response_