feat(cli): add b200 and h200 GPU options for endpoint creation

[atihkin]

https://linear.app/together-ai/issue/MLE-2932/fix-error-with-gpu-h200-not-recognized-in-cli

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Note

Adds support for new GPU types in endpoint creation.

• Extends --gpu choices to include b200 and h200
• Maps b200 -> nvidia_b200_180gb_sxm and h200 -> nvidia_h200_140gb_sxm in gpu_map for hardware ID resolution

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