Key validation for model transform

[andrewldesousa]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (please add here)

Better engineering practices

Please link to any issues this PR addresses.
#1326

Changelog

What are the changes made in this PR?
Validate the output of the model transform in SFTDataset

Test plan

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UX

If your function changed a public API, please add a dummy example of what the user experience will look like when calling it.
Example of docstring: https://github.com/pytorch/torchtune/blob/6a7951f1cdd0b56a9746ef5935106989415f50e3/torchtune/modules/vision_transformer.py#L285
Example in our docs: https://pytorch.org/torchtune/main/tutorials/qat_finetune.html#applying-qat-to-llama3-models

• I did not change any public API;
• I have added an example to docs or docstrings;

[pytorch-bot]

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