chore(java): update sdk generation (20260807-1333)

[soe-relewise]

https://trello.com/c/9a6hETS2/20946-java-does-not-look-to-actually-batch-products-but-send-all-in-one-go

Summary

• Updated the Java client generator to detect batchable Items and Requests collections
• Added configurable client-side chunking with a default batch size of 1,000
• Regenerated tracker, searcher, and recommender clients to send sequential chunks and aggregate collection responses
• Added credential-independent tests for chunk boundaries, request preservation, response ordering, copied collection settings, empty inputs, and batch-size validation

Validation

• ./generate.ps1: passed (existing AngleSharp NU1902 warning remains)
• mvn --batch-mode -DskipTests package --file src/pom.xml: passed
• mvn resources:resources --file src/pom.xml: passed
• mvn --batch-mode test --file src/pom.xml: not run; integration credentials are unavailable
• mvn --batch-mode -Dtest=BatchingTest,ClientConstructionTest,DateTimeSerializationTest test --file src/pom.xml: passed, 10 tests

Notes

• Tested with my own DATASET_ID and API_KEY locally.
• The original request object remains unchanged while batches are sent sequentially in their original order.