Warn if there if a chat template is provided by the model's tokenizer configuration and a caht_template is defined in the yaml

[winglian]

⚠️ Please check that this feature request hasn't been suggested before.

• I searched previous Ideas in Discussions didn't find any similar feature requests.
• I searched previous Issues didn't find any similar feature requests.

🔖 Feature description

There might be a mismatch between an existing chat template and a defined one.

✔️ Solution

Simply warn the user for now and continue

❓ Alternatives

No response

📝 Additional Context

No response

Acknowledgements

• My issue title is concise, descriptive, and in title casing.
• I have searched the existing issues to make sure this feature has not been requested yet.
• I have provided enough information for the maintainers to understand and evaluate this request.

[Taytay]

@winglian : Is there a way to tell Axoltl to simply use the chat template of the tokenizer? I couldn't tell. I know that I can tell it what kind of format the dataset is in, but I didn't know how that affected the templating if the tokenizer has a different template defined.