Add Ministral 3 Examples

[kamran-nvidia]

What does this PR do ?

• Adds Ministral 3 script Examples(examples/models/vlm/ministral3/)

Changelog

Added complete example directory with:

• README.md - Overview and links to each script
• conversion.sh - HF ↔ Megatron checkpoint conversion commands
• sft.sh - Full-parameter supervised fine-tuning with TP/PP variants
• peft.sh - LoRA fine-tuning with TP/PP variants
• inference.sh - Inference with HF, imported, and exported checkpoints

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[kamran-nvidia]

/ok to test 30b84a2

[kamran-nvidia]

/ok to test e927773