Add serving example for model multiplexing using Ray

[ratnopamc]

Add serving example of model multiplexing using Ray.

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What is the outcome that you are trying to reach?

Describe the solution you would like

Model multiplexing is a powerful technique that enables efficient inference serving for Generative AI models. By co-locating multiple models on the same GPU resources, model multiplexing optimizes hardware utilization and reduces inference latency.

Add serving script using Ray and vLLM that demonstrates usage of model multiplexing on GPU-s.

Describe alternatives you have considered

Additional context