feat(genai): add image generation samples (2)

[jdomingr]

Description

Add new image generation samples using imagen-3.0-capability-001 model:

• Image generation with subject reference
• Image generation with style reference
• Image generation with raw reference
• Image generation with scribble control reference
• Image generation with canny control reference

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/ImageGenCannyCtrlTypeWithTextAndImage.java:19, tag googlegenaisdk_imggen_canny_ctrl_type_with_txt_img
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenRawReferenceWithTextAndImage.java:19, tag googlegenaisdk_imggen_raw_reference_with_txt_img
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenScribbleCtrlTypeWithTextAndImage.java:19, tag googlegenaisdk_imggen_scribble_ctrl_type_with_txt_img
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenStyleReferenceWithTextAndImage.java:19, tag googlegenaisdk_imggen_style_reference_with_txt_img
• genai/snippets/src/main/java/genai/imagegeneration/ImageGenSubjectReferenceWithTextAndImage.java:19, tag googlegenaisdk_imggen_subj_refer_ctrl_refer_with_txt_imgs

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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 significantly expands the generative AI capabilities by introducing a suite of new image generation samples for the imagen-3.0-capability-001 model. These additions provide developers with practical examples for advanced image manipulation using various reference inputs, enhancing the overall utility and demonstration of the GenAI SDK.

Highlights

• New Image Generation Samples: Added five new image generation samples utilizing the imagen-3.0-capability-001 model, showcasing various reference types.
• Reference Types: The new samples cover image generation with subject, style, raw, scribble control, and canny control references, providing diverse use cases.
• Dependency Update: The pom.xml file was updated to include the google-cloud-storage dependency, necessary for handling GCS URIs in the new samples.
• Integration Tests: Comprehensive integration tests have been added for all new image generation samples to ensure their functionality and correctness.

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[gemini-code-assist]

Code Review

This pull request introduces a set of new image generation samples for the imagen-3.0-capability-001 model, complete with integration tests. The new samples demonstrate various features like subject/style/control references. The code is generally well-written, but I've identified a few areas for improvement. My feedback includes correcting a hardcoded GCS URI in a sample, fixing a typo in a constant name within the tests, and suggestions to improve code readability by simplifying string concatenations.

[msampathkumar]

@jdomingr - check and fix the test file conflict