Add CLM training example (#248)
* copied run_clm script from transformers/examples + added requirements file
* added optimum support + ort flag
* added brief readme + moved files into language-modeling folder oops
* reformatted run_clm.py
* changed requirements text file according to suggestions + reformatted run_clm.py
* removed ORT flag from run_clm.py script and uses ORTTrainer by default
* updated README to match
* Update requirements.txt
protobuf > 3.21.x will break the training.
* Update the min version of trfrs
Co-authored-by: carzh <t-carzhu@microsoft.com>
Co-authored-by: Jingya HUANG <44135271+JingyaHuang@users.noreply.github.com>
