Add resiliency examples for ft launcher and straggler detection

[ananthsub]

What does this PR do ?

These serve as code examples to accompany the documentation here: https://docs.nvidia.com/nemo/megatron-bridge/latest/training/resiliency.html

The examples here highlight the straggler detection and fault tolerant job launching (directly using the ft_launcher) integrations through NVRx. These examples provide a starting point similar to what nemo2 offered here: https://github.com/NVIDIA-NeMo/NeMo/tree/main/examples/llm/resiliency

and what was tested against in nvrx here: https://github.com/NVIDIA/nvidia-resiliency-ext/tree/main/tests/ptl_resiliency/func/nemo20

Changelog

• Add resiliency examples for fault tolerant job launching and straggler detection

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Additional Information

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Summary by CodeRabbit

• Documentation

  • Added resiliency features documentation including prerequisites and use case guides.

• New Features

  • Added straggler detection example code and deployment scripts for distributed training.
  • Added fault-tolerance example code with automatic hang detection, job restart capabilities, and optional fault simulation capabilities.

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[ananthsub]

/ok to test 8623ba6