Expose num processes in PyT Dist for NeMo 24.05

[mikolajblaz]

What does this PR do ?

Expose multiprocessing setting for PyT Distributed checkpoint format.

Collection: NLP

Changelog

• Add model.dist_ckpt_torch_dist_multiproc flag controlling intra-rank parallelism for PyT Distributed checkpoint saving

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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