Added use_liger flag to Trainer
Author: shimizust
Pull request: yes

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Comments:
cc @muellerzr @SunMarc 

Quick question @shimizust , I see that there is already another PR opened [here](https://github.com/huggingface/transformers/pull/32860). Which one should we focus on ? 

> Quick question @shimizust , I see that there is already another PR opened [here](https://github.com/huggingface/transformers/pull/32860). Which one should we focus on ?

Hi @SunMarc thanks for the review! I'm going to incorporate your suggestions and merge into the original [PR](https://github.com/huggingface/transformers/pull/32860) and close this one

Using this PR instead: https://github.com/huggingface/transformers/pull/32860