Move tokenizer info into pte for et

[silverguo]

For #1484

$python3 torchchat.py export llama3.1 --quantize torchchat/quant_config/mobile.json --output-pte-path exportedModels/llama3.1.pte
....
The methods are:  {'forward'}
The config methods are:  {'tokenizer_type'}
....
$torchchat/utils/scripts/build_native.sh et
....
$cmake-out/et_run exportedModels/llama3.1.pte -z `python3 torchchat.py where llama3.1`/tokenizer.model -i "Once upon a time"
....
Once upon a time, in a land far, far away, there was a small village nestled between two great mountains. In this peaceful village, a wise and gentle soul named Sophia lived. Sophia was renowned for her extraordinary kindness, compassion, and ability to understand and communicate with all living creatures.
Her kindness was not limited to humans; she had a special gift for understanding and talking to animals. The villagers would often joke that Sophia had an "animal whisperer" role in her village. Her deep understanding and gentle demeanor had earned the trust of the animals, who would come from far and wide to seek her counsel and wisdom.
Sophia

achieved tok/s: 20.268114
....

Worked without passing -l.

[pytorch-bot]

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