feat(genai): add samples for bounding box and express mode

[jdomingr]

Description

Add new genai samples

• Bounding box with text and image input
• Express mode using vertex AI Api key

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 2 region tags.

• genai/snippets/src/main/java/genai/boundingbox/BoundingBoxWithTxtImg.java:19, tag googlegenaisdk_boundingbox_with_txt_img
• genai/snippets/src/main/java/genai/expressmode/ExpressModeWithApiKey.java:19, tag googlegenaisdk_vertexai_express_mode

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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 enhances the Generative AI samples by adding two new Java examples. The first sample illustrates a multimodal use case where the Gemini model processes an image and text prompt to identify objects and return their bounding box coordinates, which are then plotted onto the original image. The second sample provides a straightforward demonstration of utilizing the Vertex AI API for content generation by authenticating with an API key in express mode. These additions expand the utility and coverage of the existing sample set.

Highlights

• Bounding Box Sample: Introduces a new Java sample demonstrating how to use the Gemini model to detect and plot bounding boxes on an image, given both text and image input.
• Express Mode Sample: Adds a new Java sample showcasing how to use the Vertex AI API in "express mode" with an API key for content generation.

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[gemini-code-assist]

Code Review

This pull request introduces two new GenAI samples for Java: one demonstrating bounding box detection with text and image inputs, and another showcasing Express Mode with a Vertex AI API key. The implementation is solid and includes corresponding tests. I've provided a couple of suggestions for the bounding box sample to improve its robustness and code clarity. Overall, great additions!