Expose export_llama.py as a library or function able to be called and imported in Python

[ProjectProgramAMark]

🚀 The feature, motivation and pitch

It would be nice to be able to call the code in examples/models/llama/export_llama.py as a function. That way, this can be fit into the workflow of a larger pipeline. For example, if one needs to fine tune llama using HuggingFace Transformers, merge adapters into the model, then convert hf .safetensors to checkpoint.pth, then finally export to .pte, it would be convenient to be able to call this last part.

Alternatives

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Additional context

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RFC (Optional)

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