Add a new sample ADK agent: food-order-assistant #456
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Add a new sample agent, food-order-assistant.
This PR contains the implementation of a conversational AI assistant designed to streamline the customer ordering food items. The assistant can understand and process customer orders in natural language, making it suitable for various voice- and text-based channels.
The AI assistant is implemented by 4 sub-agents specialized in their tasks and a parent agent that orchestrates them. In order to achieve more reliable and low-latency conversational flow, this sample implements the custom workflow agent, which programmatically picks the next agent to execute, based on the session states. Additionally, this uses structured outputs and model callbacks to keep the latency low while maintaining the high quality conversation flow.