[fix]update apply_chat_template (#4137)

* update apply_chat_template

* fix unittest

* fix unittest

* fix

* fix

* fix unit test

* fix

* fix unit test

* add unit test

fastdeploy/engine/engine.py

@@ -220,7 +220,9 @@ class LLMEngine:
         if sampling_params is not None:
             request.sampling_params = sampling_params
         request.preprocess_start_time = time.time()
-
+        chat_template_kwargs = kwargs.get("chat_template_kwargs") or {}
+        chat_template_kwargs["chat_template"] = kwargs.get("chat_template")
+        kwargs["chat_template_kwargs"] = chat_template_kwargs
         request = self.data_processor.process_request(request, self.cfg.max_model_len, **kwargs)
         request.prompt_token_ids_len = len(request.prompt_token_ids)
         request.need_prefill_tokens = request.prompt_token_ids_len