[Python] Deprecate native SpannerIO implementation (#35860)

[Kaustubh1204]

Summary

Deprecates the native SpannerIO implementation in the Python SDK as discussed in #35860.

Changes

• Marked native SpannerIO as deprecated.
• Updated related references and documentation (if applicable).
• Ensured existing tests pass without regression.

Testing

• Ran Python SDK tests:
  ./gradlew :sdks:python:test --rerun-tasks
• Build completed successfully.

Fixes #35860

[gemini-code-assist]

Summary of Changes

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This pull request formally deprecates the native Python SpannerIO implementation within the SDK. The changes introduce explicit deprecation warnings and decorators across the relevant classes and functions, guiding users towards the recommended cross-language SpannerIO module. This move ensures a consistent and future-proof approach to Spanner integration within the Apache Beam ecosystem.

Highlights

• Native SpannerIO Deprecation: The native Python SpannerIO implementation has been marked as deprecated in version 2.68 and is scheduled for removal in Beam 3.0. Users are now directed to use the cross-language SpannerIO available in apache_beam.io.gcp.spanner.

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Changelog

• sdks/python/apache_beam/io/gcp/experimental/spannerio.py
  • Added a module-level deprecation notice at the top of the file.
  • Imported the warnings module to enable deprecation warnings.
  • Defined a global _DEPRECATION_MESSAGE constant for consistent messaging.
  • Applied @deprecated decorators to ReadOperation.__new__, create_transaction, ReadFromSpanner, WriteToSpanner, MutationGroup.__init__, and WriteMutation.__init__.
  • Updated the current argument in the @deprecated decorator for WriteToSpanner to reflect the correct cross-language SpannerIO path.

Activity

• The native SpannerIO implementation was marked as deprecated.
• Related references and documentation were updated to reflect the deprecation.
• Existing Python SDK tests were executed and passed successfully.
• The build process completed without any issues.

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