feat(genai): Add samples for image, tuning and thinking generation.

[cfloress]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

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_edit_img_with_txt_img.go:18, tag googlegenaisdk_imggen_mmflash_edit_img_with_txt_img
• genai/image_generation/imggen_with_txt.go:18, tag googlegenaisdk_imggen_with_txt
• genai/thinking/thinkgen_include_thoughts_with_txt.go:18, tag googlegenaisdk_thinking_includethoughts_with_txt
• genai/tuning/tuning_list_jobs.go:18, tag googlegenaisdk_tuning_job_list

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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 GenAI Go samples by introducing new functionalities for image generation, including text-to-image and multimodal image editing. It also adds a sample for understanding the model's reasoning through "thinking generation" and provides a utility to list tuning jobs, enhancing the SDK's example coverage for advanced AI capabilities.

Highlights

• Image Generation Samples: New samples demonstrating text-to-image generation and image editing with multimodal inputs.
• Thinking Generation Sample: A new sample showcasing how to retrieve the model's internal thought process during text generation.
• Tuning Job Listing Sample: A new sample illustrating how to list available tuning jobs.

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[gemini-code-assist]

Code Review

This pull request introduces new Go samples for the GenAI SDK, covering image generation, model thinking processes, and tuning jobs. The additions are valuable, but I've identified a few areas for improvement. My feedback includes suggestions to refactor the image generation samples to avoid hardcoded file paths, which will improve their reusability and testability. I've also pointed out a logical issue in the 'thinking' sample that leads to redundant output, a leftover debug statement in a test file, and an opportunity to enhance the tuning sample by implementing pagination for a more complete example.

[Guiners]

LGTM