[AI] [Inference] - beta 3 changes

[glharper]

Description

• Add JSON Structured output classes
• Image Embeddings samples

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

com.azure:azure-ai-inference

[dargilco]

The PR description says "image embeddings samples". But I can't find any in the PR....

Don't forget to update CHANGELOG.md

[dargilco]

Where did this API version come from? We only have one API version, 2024-05-01-preview.

[glharper]

This API version is required for structured JSON output to work on the gpt-4o AOAI endpoints, otherwise I get a "not supported" error.

[dargilco]

Please also update CHANGELOG.md. See Python for example text: https://github.com/Azure/azure-sdk-for-python/blob/feature/azure-ai-inference-beta9/sdk/ai/azure-ai-inference/CHANGELOG.md