add kafka to spanner blueprint, IT etc

[derrickaw]

1. add kafka to spanner blueprint, IT etc
2. update kafka options

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.00%. Comparing base (5663e39) to head (c5e0358).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4365      +/-   ##
============================================
+ Coverage     33.89%   38.00%   +4.11%     
- Complexity      505      513       +8     
============================================
  Files           215      195      -20     
  Lines         13186    11814    -1372     
  Branches       1320     1197     -123     
============================================
+ Hits           4469     4490      +21     
+ Misses         8350     6956    -1394     
- Partials        367      368       +1     

Components	Coverage Δ
spanner-templates	∅ <ø> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	∅ <ø> (∅)
spanner-live-reverse-replication	∅ <ø> (∅)
spanner-bulk-migration	∅ <ø> (∅)
gcs-spanner-dv	∅ <ø> (∅)
see 22 files with indirect coverage changes

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[gemini-code-assist]

Summary of Changes

Hello, 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 expands the Dataflow YAML template library by adding support for streaming data from Apache Kafka to Cloud Spanner. The changes include the necessary template definitions, configuration options, and integration tests. Additionally, the PR performs a cleanup of existing Kafka-based templates to maintain parameter consistency and introduces a new configuration field for read time management.

Highlights

• New Template Added: Introduced the Kafka to Spanner YAML template, enabling streaming data ingestion from Apache Kafka to Cloud Spanner.
• Configuration Updates: Refactored Kafka template parameters by removing redundant fields and adding the 'maxReadTimeSeconds' option across Kafka-to-BigQuery and Kafka-to-Iceberg templates.
• Integration Testing: Added a comprehensive integration test suite for the new Kafka to Spanner template to ensure pipeline reliability.

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[gemini-code-assist]

Code Review

This pull request introduces a new Kafka to Spanner (YAML) template, including its Java interface, options, pipeline definition, documentation, and integration tests. Additionally, it refactors the Kafka options across other YAML templates (BigQuery and Iceberg) by removing several duplicate-related parameters and adding maxReadTimeSeconds. The review feedback identifies critical syntax errors in the newly added KafkaToSpanner.yaml file, specifically pointing out that the filesToCopy and requirements properties are incorrectly formatted and should be defined as standard YAML sequences to prevent parsing and execution failures.

[damccorm]

There's heavy overlap with #4363 (and comments that apply across both) so I'm going to let that one get to completion and then we can follow up with review here.