[Feature] vLLM CLI (#5090)

Co-authored-by: simon-mo <simon.mo@hey.com>

benchmarks/benchmark_serving.py

@@ -2,8 +2,8 @@
 
 On the server side, run one of the following commands:
     vLLM OpenAI API server
-    python -m vllm.entrypoints.openai.api_server \
-        --model <your_model> --swap-space 16 \
+    vllm serve <your_model> \
+        --swap-space 16 \
         --disable-log-requests
 
     (TGI backend)