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Xin Liu 5efec068c9 feat: Implement stream interface (#15875 )

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Major changes:

- Rename `wasm_chat.py` to `llama_edge.py`
- Rename the `WasmChatService` class to `ChatService`
- Implement the `stream` interface for `ChatService`
- Add `test_chat_wasm_service_streaming` in the integration test
- Update `llama_edge.ipynb`

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Signed-off-by: Xin Liu <sam@secondstate.io>

2024-01-11 21:32:48 -08:00