Add default chat template to tokenizer_config.json

[Automated] This PR adds the default chat template to the tokenizer config, allowing the model to be used with the new conversational widget (see [PR](https://github.com/huggingface/huggingface.js/pull/457)).

If the default is not appropriate for your model, please set `tokenizer.chat_template` to an appropriate template. See https://huggingface.co/docs/transformers/main/chat_templating for more information.

tokenizer_config.json

@@ -1 +1,11 @@
-{"bos_token": "<s>", "eos_token": "</s>", "unk_token": "<unk>", "pad_token": "<pad>", "cls_token": "<cls>", "mask_token": "<mask>", "special_tokens_map_file": "/gdrive/My Drive/Colab Notebooks/donnees/textgen_fr/chatbot/gpt2-medium-frtok/special_tokens_map.json", "full_tokenizer_file": null}
+{
+  "bos_token": "<s>",
+  "eos_token": "</s>",
+  "unk_token": "<unk>",
+  "pad_token": "<pad>",
+  "cls_token": "<cls>",
+  "mask_token": "<mask>",
+  "special_tokens_map_file": "/gdrive/My Drive/Colab Notebooks/donnees/textgen_fr/chatbot/gpt2-medium-frtok/special_tokens_map.json",
+  "full_tokenizer_file": null,
+  "chat_template": "{% for message in messages %}{{ message.content }}{{ eos_token }}{% endfor %}"
+}