FSDP + PEFT

[zpx01]

What does this PR do ?

Enables FSDP when using PEFT during training/fine-tuning.

Collection: [NLP]

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[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[cuichenx]

closing since fsdp + peft is deprioritized