add fsdp support for fine-tuning

[dimapihtar]

What does this PR do ?

Adds FSDP support for NeMo fine-tuning.

Collection: NLP

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• [x] New Feature
• [ ] Bugfix
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[dimapihtar]

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[dimapihtar]

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[github-actions[bot]]

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.