Add image support to GenerativeAI.Microsoft

[ericstj]

cc @stephentoub

This PR adds image generation support to GenerativeAI.Microsoft, with a basic sample in the readme.

Here's a screenshot of what the sample does:

[coderabbitai]

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Warning

Tools execution failed with the following error:

Failed to run tools: 8 RESOURCE_EXHAUSTED: Received message larger than max (8242201 vs 4194304)

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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[stephentoub]

Nice