Update NeMo to hf convertion for Llama 3

[JesusPaz]

What does this PR do ?

Fix the script to convert Llama 3 from NeMo to hf format.

Changelog

• Stop using LlamaTokenizer and start using AutoTokenizer from Transformers.

Usage

python3 NeMo/scripts/checkpoint_converters/convert_llama_nemo_to_hf.py \
    --input_name_or_path llama3-8b.nemo \
    --output_path llama3-8b-hf/pytorch_model.bin \
    --hf_input_path Meta-Llama-3-8B \
    --hf_output_path llama3-8b-hf \
    --input_tokenizer Meta-Llama-3-8B \
    --hf_output_tokenizer llama3-8b-hf

you must except something like this when the script finishes:

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Additional Information

• there is an issue in hf related but is not the same script https://huggingface.co/meta-llama/Meta-Llama-3-8B-Instruct/discussions/37

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