refactor: The first refactored version for sdk release (#907)

Co-authored-by: chengfangyin2 <chengfangyin3@jd.com>

dbgpt/model/llm_out/llama_cpp_llm.py

@@ -0,0 +1,8 @@
+from typing import Dict
+import torch
+
+
+@torch.inference_mode()
+def generate_stream(model, tokenizer, params: Dict, device: str, context_len: int):
+    # Just support LlamaCppModel
+    return model.generate_streaming(params=params, context_len=context_len)