Add `chat_template` to `tokenizer_config.json`

Reference: https://huggingface.co/docs/transformers/main/en/chat_templating#what-template-should-i-use

tokenizer_config.json

@@ -26,6 +26,7 @@
     }
   },
   "bos_token": "<s>",
+  "chat_template": "{% if not add_generation_prompt is defined %}{% set add_generation_prompt = false %}{% endif %}{% for message in messages %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}",
   "clean_up_tokenization_spaces": false,
   "eos_token": "</s>",
   "legacy": false,