feat(genai): Add samples for img and thinking generation+sdk update

[cfloress]

Description

Fixes #

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Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• genai/image_generation/imggen_mmflash_locale_aware_with_txt.go:18, tag googlegenaisdk_imggen_mmflash_locale_aware_with_txt
• genai/image_generation/imggen_mmflash_multiple_imgs_with_txt.go:18, tag googlegenaisdk_imggen_mmflash_multiple_imgs_with_txt
• genai/image_generation/imggen_virtual_try_on_with_txt_img.go:18, tag googlegenaisdk_imggen_virtual_try_on_with_txt_img
• genai/thinking/thinking_budget_with_txt.go:18, tag googlegenaisdk_thinking_budget_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @cfloress, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the Generative AI (GenAI) Go samples by introducing new functionalities for image generation and a novel "thinking" feature. It includes examples for creating locale-aware images, generating multiple images from a single prompt, and performing virtual try-ons. Additionally, a sample demonstrating how to expose the model's internal thought process during text generation has been added. These additions are accompanied by an update to the google.golang.org/genai SDK to its latest version, ensuring compatibility and access to the newest features.

Highlights

• SDK Update: The google.golang.org/genai module has been updated from version v1.17.0 to v1.25.0.
• Image Generation Samples: New samples have been added demonstrating various image generation capabilities, including locale-aware image content, generating multiple images from a single prompt, and virtual try-on functionality.
• Thinking Generation Sample: A new sample has been introduced to showcase the model's "thinking" process, allowing users to generate text that includes the model's internal thought steps with a configurable budget.
• New Test Files: Corresponding test files (image_generation_examples_test.go and thinking_examples_test.go) have been added to validate the new image and thinking generation samples.

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[gemini-code-assist]

Code Review

This pull request introduces new GenAI samples for image generation and the 'thinking' feature, along with an update to the google.golang.org/genai SDK. The new samples are well-structured and include corresponding tests. My review focuses on improving the robustness and maintainability of the new image generation examples. Specifically, I've suggested adding checks for API responses to prevent potential panics and ensuring that output directories are created before writing files to them. I've also recommended using constants for file paths to improve code clarity.

[Guiners]

LGTM