feat(genai): add batch prediction samples (1) and update GenAI SDK

[jdomingr]

Description

Add new batch prediction samples and update SDK:

• Create a batch prediction job with Google Cloud Storage
• Create a batch prediction job with embedding model and Google Cloud Storage
• Update SDK to v1.20.0

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/batchprediction/BatchPredictionEmbeddingsWithGcs.java:19, tag googlegenaisdk_batchpredict_embeddings_with_gcs
• genai/snippets/src/main/java/genai/batchprediction/BatchPredictionWithGcs.java:19, tag googlegenaisdk_batchpredict_with_gcs

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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 GenAI SDK samples by introducing new functionalities for batch predictions. It includes two distinct samples: one for general batch prediction using models like Gemini Flash with Google Cloud Storage, and another specifically for embedding models, also leveraging GCS. Concurrently, the underlying GenAI SDK has been upgraded to version 1.20.0 to support these new features and ensure up-to-date compatibility.

Highlights

• SDK Update: The google-genai dependency in pom.xml was updated from version 1.15.0 to 1.20.0.
• New Batch Prediction Sample (General): A new Java sample, BatchPredictionWithGcs.java, was added to demonstrate creating a batch prediction job with a general model (e.g., gemini-2.5-flash) using Google Cloud Storage for input and output.
• New Batch Prediction Sample (Embeddings): A new Java sample, BatchPredictionEmbeddingsWithGcs.java, was added specifically for creating a batch prediction job with an embedding model (e.g., text-embedding-005) and Google Cloud Storage.
• Integration Tests: Corresponding integration tests (BatchPredictionIT.java) were added to validate the functionality of these new batch prediction samples, including mocking the client to verify job creation and state.

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[gemini-code-assist]

Code Review

This pull request adds two new samples for batch prediction using the GenAI SDK (one for embeddings and one for generative models) and updates the SDK version. The new samples demonstrate how to create a batch job and poll for its completion. My review includes suggestions to improve code clarity and maintainability in the new samples by using more efficient data structures and avoiding magic numbers. I've also suggested an improvement to the integration tests to ensure the job polling logic is covered.