update iceberg add files parameters

[derrickaw]

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Summary of Changes

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This pull request expands the configuration capabilities for Iceberg IO within the Apache Beam YAML SDK. By exposing 'manifest_file_size' and 'sort_fields' as configurable parameters, users gain finer control over the Iceberg table writing process. The changes include updates to the standard IO definitions and corresponding integration tests to ensure these new parameters are correctly handled.

Highlights

• Iceberg IO Configuration: Added support for 'manifest_file_size' and 'sort_fields' parameters to the Iceberg IO configuration in standard_io.yaml.
• Test Coverage: Updated the Iceberg add files test suite to include and verify the new configuration parameters.

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Code Review

This pull request adds support for manifest_file_size and sort_fields to the Iceberg YAML configuration and updates the test pipeline to use them. The review feedback points out that these new parameters must also be defined in the properties schema of the transform to prevent YAML validation failures.

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[gemini-code-assist]

When adding new parameters to the mappings of an underlying provider, they must also be defined in the properties schema of the transform (typically located above the underlying_provider section in this file). If they are omitted from the schema, YAML validation will fail when these parameters are used in pipelines (such as in the test file). Add manifest_file_size (as an integer) and sort_fields (as an array of strings) to the transform's properties schema if they are not already present.

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R: @tvalentyn for label python.

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