feat(genai): Add new image Generation samples

[msampathkumar]

Local aware & Multiple images generation

Description

Fixes #

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Checklist

• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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 2 region tags.

• genai/image_generation/imggen_mmflash_locale_aware_with_txt.py:17, tag googlegenaisdk_imggen_mmflash_locale_aware_with_txt
• genai/image_generation/imggen_mmflash_multiple_imgs_with_txt.py:17, tag googlegenaisdk_imggen_mmflash_multiple_imgs_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @msampathkumar, 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 library's image generation capabilities by introducing new samples that demonstrate advanced features such as locale-aware image generation and the ability to generate multiple images from a single prompt. Alongside these new additions, the PR includes minor refactorings across existing image generation samples, primarily focusing on standardizing output file paths to a dedicated output_folder and improving code readability through consistent import statement formatting. These changes aim to provide clearer examples and a more organized structure for image generation outputs.

Highlights

• New Image Generation Samples: Two new image generation samples have been added: one demonstrating locale-aware image generation and another showcasing the ability to generate multiple images from a single prompt using the gemini-2.0-flash-preview-image-generation model.
• Output Path Standardization: Output file paths across various image generation samples have been standardized to save generated images and related files into a new output_folder/ directory, improving organization and consistency.
• Code Readability Improvements: Import statements in several Python files have been reformatted to use multi-line parentheses, enhancing code readability and adherence to style guidelines.
• Test Suite Enhancements: The test suite has been updated to include comprehensive tests for the newly added image generation samples and to streamline existing test assertions for better maintainability.

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[gemini-code-assist]

Code Review

This pull request adds new image generation samples and refactors existing ones. The changes include adding samples for locale-aware generation and multiple image generation. My review focuses on some bugs in the new sample files, specifically incorrect return values and flawed loop logic. I've also pointed out a regression in the test suite where file cleanup and proper assertions have been removed, which could lead to test artifacts and less reliable tests. The formatting changes across multiple files are consistent and improve readability.