SnowflakeIO yaml

[Amar3tto]

Adds Beam YAML support for Snowflake IO.

• Adds ReadFromSnowflake for batch reads from a table or query.
• Adds WriteToSnowflake for batch writes and streaming writes via Snowpipe.
• Supports password, OAuth, and private key authentication.
• Adds Beam Row / Snowflake schema conversion.
• Registers both transforms in standard_io.yaml.
• Adds unit tests for configuration, authentication, schema mapping, and batch/streaming behavior.

https://github.com/apache/beam/actions/runs/31692701363
https://github.com/apache/beam/actions/runs/31691059139

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[Abacn]

Prefer not introducing SuppressWarnings for new code

[Amar3tto]

Fixed

[Abacn]

Why not just make SnowflakeReadSchemaTransformProvider.Configuration as createDataSourceConfiguration's parameter?

[Amar3tto]

It is shared by both the read and write providers, which have different configuration classes. Passing the individual fields keeps this utility independent of either provider-specific configuration.

[Abacn]

return value is unused. I understand it's for validation. Consider add a comment noting it.

[Amar3tto]

Done

[github-actions]

Assigning reviewers:

R: @claudevdm for label python.
R: @kennknowles for label java.

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