Building a Voice Assistant with the Agents SDK

[rupert-openai]

Summary

This PR introduces the cookbook "Building a Voice Assistant with the Agents SDK" showcasing the new voice agents functionality to quickly deploy a voice based assistant with the ability to perform multiple different tasks

Motivation

Currently we don't have any cookbooks showcasing the amazing ease at which you can turn agentic text based solutions into voice based ones with the Agents SDK, this is a massive unlock! As a result i've added this simple cookbook walking through the steps to build an agentic workflow, convert to voice and optimize

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