Add Template and Blueprint support for Kafka to Iceberg

[tarun-google]

1. Add kafka-Iceberg YAML Blueprint and Template
2. Add Service Options tuned for kafka-Iceberg pipelines

[gemini-code-assist]

Summary of Changes

Hello @tarun-google, 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 new Dataflow template designed to streamline the process of ingesting real-time data from Kafka into Apache Iceberg tables. The template provides a robust, configurable solution for streaming data, allowing users to define Kafka connection details, message formats, and Iceberg catalog and table properties. This addition enhances the data integration capabilities by enabling efficient and scalable data transfer from Kafka to Iceberg, complete with an integration test to ensure reliability.

Highlights

• New Dataflow Template: Introduced a new Dataflow template named 'Kafka to Iceberg (YAML)' for streaming data ingestion.
• Streaming Data Pipeline: The template enables a streaming pipeline that reads data from Kafka topics and writes it to Apache Iceberg tables.
• Comprehensive Configuration: Provides extensive configuration parameters for both Kafka source (e.g., bootstrap servers, topic, schema, format) and Iceberg sink (e.g., table, catalog properties, partition fields).
• Integration Testing: Includes a dedicated integration test to ensure the end-to-end functionality and reliability of the Kafka to Iceberg template.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.70%. Comparing base (52ba06f) to head (d572c28).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3097      +/-   ##
============================================
+ Coverage     50.40%   50.70%   +0.30%     
- Complexity     5021     5071      +50     
============================================
  Files           970      974       +4     
  Lines         59609    59872     +263     
  Branches       6507     6536      +29     
============================================
+ Hits          30047    30361     +314     
+ Misses        27439    27370      -69     
- Partials       2123     2141      +18     

Components	Coverage Δ
spanner-templates	70.87% <ø> (+0.22%)	⬆️
spanner-import-export	68.99% <ø> (ø)
spanner-live-forward-migration	80.06% <ø> (+0.02%)	⬆️
spanner-live-reverse-replication	77.74% <ø> (+0.27%)	⬆️
spanner-bulk-migration	88.35% <ø> (+0.10%)	⬆️
see 40 files with indirect coverage changes

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