feat: Add photo discovery sample built with Flutter, Vertex AI Search, and Reasoning Engine

[khanhnwin]

Description

Adding the sample app built for I/O 2024 session with @kazunori279: Build generative AI agents with Vertex AI Agent Builder and Flutter

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[khanhnwin]

CC @koverholt! First time opening a PR for this repo, so please let me know if anything needs fixing. Thank you!

[koverholt]

Thanks for your contribution here! I'll review now and post feedback shortly. But this looks like a great example and companion code for your existing talk! 🙏

[koverholt]

Thanks for contributing this example as sample code for your session. It's a great example use case + use of Flutter that I love to see added to this repo! Let me know if I can help clarify any of the comments / feedback.

[khanhnwin]

Accept your suggestions @holtskinner! Thanks so much for the review!

@kazunori279 There's a few comments remaining from Kris for Vertex Agent side of things. Once you've resolved those, I think we're good to land!

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