optimize relay performance

[laolarou726]

PR-Codex overview

This PR focuses on refactoring and enhancing the relay messaging system in the ConnectX project. It introduces new message classes, updates existing ones, and modifies the handling of relay connections to improve functionality and maintainability.

Detailed summary

• Deleted RelayLinkCreatedMessage.cs.
• Added RelayDataLinkCreatedMessage and RelayWorkerLinkCreatedMessage.
• Updated CreateRelayLinkMessage to CreateRelayDataLinkMessage with new properties.
• Introduced CreateRelayWorkerLinkMessage with UserId, RelayTo, and RoomId.
• Modified message handlers in RelayServer to support new message types.
• Refactored RelayManager to manage data and worker sessions separately.
• Updated connection handling in RelayConnection to differentiate between data and worker links.
• Enhanced logging for worker session establishment and disconnection.
• Adjusted session management in RelayManager to track data sessions.

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