[spannerchangestreamstobigquery] Spanner Change Stream to BigQuery UUID support

[googledrew]

Fix for #3703

[gemini-code-assist]

Summary of Changes

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This pull request introduces support for the UUID data type within the Spanner Change Streams to BigQuery data pipeline. The changes ensure that UUID fields, including arrays of UUIDs, are correctly identified, processed, and mapped to compatible STRING types in BigQuery. Additionally, the integration tests were updated to include scenarios for UUID data, and minor configuration improvements were made to the test suite.

Highlights

• UUID Support: Added support for UUID data types in Spanner Change Streams to BigQuery, ensuring proper mapping for both GoogleSQL and PostgreSQL dialects.
• Schema Mapping: Updated schema utility classes to correctly handle UUID and ARRAY types, mapping them to STRING in BigQuery.
• Integration Testing: Expanded test coverage with new unit and integration tests to validate UUID data ingestion and schema creation.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.51%. Comparing base (b8203be) to head (e4534fa).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3698      +/-   ##
============================================
- Coverage     52.52%   52.51%   -0.01%     
+ Complexity     6251     5847     -404     
============================================
  Files          1065     1065              
  Lines         64318    64329      +11     
  Branches       7119     7124       +5     
============================================
+ Hits          33781    33782       +1     
- Misses        28256    28265       +9     
- Partials       2281     2282       +1     

Components	Coverage Δ
spanner-templates	72.11% <ø> (-0.05%)	⬇️
spanner-import-export	68.53% <ø> (-0.12%)	⬇️
spanner-live-forward-migration	80.86% <ø> (-0.02%)	⬇️
spanner-live-reverse-replication	77.57% <ø> (-0.02%)	⬇️
spanner-bulk-migration	89.38% <ø> (-0.01%)	⬇️
gcs-spanner-dv	85.73% <ø> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
...igquery/schemautils/SpannerChangeStreamsUtils.java	80.56% <ø> (ø)
...tobigquery/schemautils/SpannerToBigQueryUtils.java	68.02% <100.00%> (+2.37%)	⬆️
...hangestreamstobigquery/schemautils/TypesUtils.java	60.00% <100.00%> (+1.66%)	⬆️

... and 5 files with indirect coverage changes

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[tianz101]

Added a few comments.