Add AI Agent sample console app

[MaryanneNjeri]

This PR

Adds the AI agent sample console app, that we will include in the AI Agent configuration doc. The agent is created declaratively check out creating agents declaratively for more information.

Sample yaml agent spec used for this sample

        kind: Prompt
        name: WeatherAgent
        description: Weather Agent
        instructions: You are a helpful assistant.
        model:
            id: gpt-4.1
            connection:
                kind: remote

In the future we will build on this sample and include tool configuration to show case dynamic configuration.