Add tokenizer.chat_template

For some reason, the chat template is missing here.

Indeed there are newer versions of the openchat 3.5 model, but - oddly - they underperform on specific tasks (like function calling and data extraction).

Appreciate if this can be merged.

tokenizer_config.json

@@ -48,6 +48,7 @@
     "<|pad_0|>"
   ],
   "bos_token": "<s>",
+  "chat_template": "{{ bos_token }}{% for message in messages %}{{ 'GPT4 Correct ' + message['role'].title() + ': ' + message['content'] + '<|end_of_turn|>'}}{% endfor %}{% if add_generation_prompt %}{{ 'GPT4 Correct Assistant:' }}{% endif %}",
   "clean_up_tokenization_spaces": false,
   "eos_token": "<|end_of_turn|>",
   "legacy": true,