[FEATURE] Interoperate with dubbo-java triple http3 server

[marsevilspirit]

⚠️ Verification

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have searched the release notes of this repository and believe that this is not a duplicate.

🎯 Solution Description

Customizing certain aspects of dubbo-java at the transport layer of http3:

1. Heartbeat packet
2. Graceful offline
3. Endstream processing

📋 Use Cases

...

⚖️ Complexity & Risks

Consider how to implement custom parts of dubbo-java.

🔗 External Dependencies

No response

📘 Additional Context

No response