Sample code for score model grader with image

[YusakuNo1]

Description

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[Copilot]

Pull request overview

This PR adds a new sample demonstrating how to use the score model grader with image evaluation capabilities in the Azure AI Projects SDK. It shows how to create evaluations with custom image-based grading criteria and run evaluations using the OpenAI evals API with image inputs.

Key Changes:

• Adds comprehensive sample code for score model grader with image input support
• Demonstrates custom data source configuration with image_url and caption schema
• Shows how to use InputMessagesTemplate with image content for evaluation runs