feat(spanner): enable UUID data type

[scotthart]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @scotthart, 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 full support for the UUID data type within the Spanner client library. It extends the core Value class to correctly handle UUID objects, enabling their proper conversion to and from protobuf representations. The changes also include updates to the test infrastructure and a suite of new tests to ensure the robust and accurate handling of UUIDs, both as single values and within arrays, during read and write operations.

Highlights

• UUID Data Type Support: The Spanner client library now fully supports the UUID data type, allowing users to store and retrieve UUID values in their Spanner databases.
• Value Class Integration: The core Value class has been extended to seamlessly handle UUID objects, including their conversion to and from protobuf representations for serialization and deserialization.
• Comprehensive Testing: New unit and integration tests have been added to validate the correct behavior of UUIDs across various scenarios, such as basic semantics, protobuf conversion, error handling, and array support.

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[gemini-code-assist]

Code Review

This pull request introduces support for the UUID data type in Spanner. The changes include:

• Adding the Uuid class and MakeUuid factory function.
• Integrating the Uuid type into the spanner::Value class, with corresponding implementations for proto conversion and value retrieval.
• Adding unit tests for Uuid in value_test.cc and an integration test in data_types_integration_test.cc.
• Updating the test database schema to include UUID and ARRAY<UUID> columns.

The changes are well-implemented and the test coverage is good. I have one minor suggestion to improve consistency in error handling within the Value class. Overall, this is a solid contribution.

[codecov]

Codecov Report

❌ Patch coverage is 95.58824% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.94%. Comparing base (1986715) to head (4bbfbfe).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
google/cloud/spanner/value.cc	88.23%	2 Missing ⚠️
...r/integration_tests/data_types_integration_test.cc	91.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15867   +/-   ##
=======================================
  Coverage   92.94%   92.94%           
=======================================
  Files        2458     2458           
  Lines      227590   227658   +68     
=======================================
+ Hits       211527   211607   +80     
+ Misses      16063    16051   -12     

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