[v1] EngineArgs for better config handling for v1 (#10382)

Signed-off-by: rickyx <rickyx@anyscale.com>

vllm/engine/llm_engine.py

@@ -568,7 +568,7 @@ class LLMEngine:
     ) -> "LLMEngine":
         """Creates an LLM engine from the engine arguments."""
         # Create the engine configs.
-        engine_config = engine_args.create_engine_config()
+        engine_config = engine_args.create_engine_config(usage_context)
         executor_class = cls._get_executor_cls(engine_config)
         # Create the LLM engine.
         engine = cls(