add http sse cosyvocie tts api and omni createItem function

[songguocola]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces the HttpSpeechSynthesizer for HTTP-based text-to-speech synthesis using SSE, along with associated data models and usage examples. It also adds tool calling support to OmniRealtimeConversation via a new createItem method and implements 60-second connection timeouts across several WebSocket clients to prevent indefinite blocking. Review feedback recommends addressing potential thread-safety issues when accumulating audio data, reducing the 10-minute timeout for synchronous calls to a more reasonable value, and improving type safety and exception handling during JSON parsing and connection failures.