Add GPTQModel backend

[CL-ModelCloud]

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[Qubitium]

@minimario @sidaw @mdeff PR ready for review. Add GPTQModel as optional backend in addition to vllm for benchmark inference:

• Add new backend argument default to existing vllm backend
• Add gptqmodel backend option
• GPTQModel will allow the benchmark to inference gptq quantized models on Nvidia (CUDA), Intel XPU (XPU), Apple Silicon (MPS), Intel/AMD CPU hardware acceleration via IPEX (requires avx, amx, or xmx), and finally fallback to non-accelerated CPU inference using normal Torch code.