Add NVIDIA TensorRT Model Optimizer in vLLM documentation

[Edwardf0t1]

Add NVIDIA TensorRT Model Optimizer (modelopt) in vLLM documentation under Features/Quantization

Since vLLM supports modelopt quantized models, we add a page in the documentation to include modelopt.

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[DarkLight1337]

Please also add the page to the index (docs/source/features/quantization/index.md) and update the supported hardware page (docs/source/features/quantization/supported_hardware.md).

[Edwardf0t1]

Please also add the page to the index (docs/source/features/quantization/index.md) and update the supported hardware page (docs/source/features/quantization/supported_hardware.md).

Done.