feat: Inference using vLLM with RayServe on Inf2

[ratnopamc]

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What is the outcome that you are trying to reach?

- Create a new blueprint to showcase how to use vLLM with RayServe on AWS Inf2
- Deploy any LLM model as inference example

Describe the solution you would like

Create a pattern that enables serving inference using Ray with vLLM backend on Inf2.
Create Website doc with step-by-step instructions for deployment and testing of the pattern.

Describe alternatives you have considered

Additional context

https://awsdocs-neuron.readthedocs-hosted.com/en/latest/index.html

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[ratnopamc]

The blueprint for this is merged with PR #607.