[DeepSpeed-Chat] feat: Support local path for actor, reward models.

[sepilqi]

This pull request updates the parameter --actor-model and --reward-model to use NAS path by multi nodes.

demo 1:

python train.py --actor-model facebook/opt-350m --reward-model facebook/opt-350m --deployment-type single_gpu --step 1

demo 2:

python train.py --actor-model /data/models/facebook/opt-350m --reward-model /data/models/facebook/opt-350m --deployment-type single_gpu --step 1

---=== Running Step 1 ===---
Running:
bash /code/yiminjiang/DeepSpeedExamples/applications/DeepSpeed-Chat/training/step1_supervised_finetuning/training_scripts/single_gpu/run_350m.sh /code/yiminjiang/DeepSpeedExamples/applications/DeepSpeed-Chat/output/actor-models/350m

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[sepilqi]

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