feat(genai): add image generation samples using Flash MM

[jdomingr]

Description

Add new image generation samples using Flash MM:

• Image generation with text input
• Image generation local aware with text
• Multiple image generation with text input
• Image edition with text and img input
• Text generation along with Image generation using text input.

Checklist

• I have followed Sample Format Guide
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• genai/snippets/src/main/java/genai/imagegeneration/ImageGenMmFlashEditImageWithTextAndImage.java:19, tag googlegenaisdk_imggen_mmflash_edit_img_with_txt_img
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenMmFlashLocaleAwareWithText.java:19, tag googlegenaisdk_imggen_mmflash_locale_aware_with_txt
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenMmFlashMultipleImagesWithText.java:19, tag googlegenaisdk_imggen_mmflash_multiple_imgs_with_txt
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenMmFlashTextAndImageWithText.java:19, tag googlegenaisdk_imggen_mmflash_txt_and_img_with_txt
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenMmFlashWithText.java:19, tag googlegenaisdk_imggen_mmflash_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @jdomingr, 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 introduces a comprehensive set of new Java samples for image generation using the Gemini 2.5 Flash model. These samples demonstrate various capabilities, including generating images from text, editing images with text prompts, creating multiple images from a single request, and producing multi-modal outputs that combine both text and images. The goal is to provide clear examples for developers to leverage the advanced image generation features of the Flash MM model.

Highlights

• Image Generation from Text: Added a new sample demonstrating how to generate a single image based on a text prompt using the Gemini 2.5 Flash model.
• Locale-Aware Image Generation: Introduced a sample for generating images from text input, implying potential locale awareness in the generation process.
• Multiple Image Generation: Included a sample that showcases the ability to generate multiple images from a single text prompt.
• Image Editing with Text and Image Input: Provided a sample for editing an existing image by combining it with a text instruction.
• Text and Image Generation: Added a multi-modal sample that generates both text and images in response to a text prompt, exemplified by creating an illustrated recipe.

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[gemini-code-assist]

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[msampathkumar]

/gemini review

[gemini-code-assist]

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[msampathkumar]

LGTM

[msampathkumar]

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/gemini review

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