[wip] Iceberg add files yaml transform and test

[derrickaw]

Pending #37701

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Summary of Changes

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This pull request enhances Apache Beam's capabilities by integrating a new YAML-based transform for managing Iceberg tables. It provides a streamlined way to add data files to an existing Iceberg table, which is crucial for data ingestion and maintenance workflows. The changes include the definition of the new transform and a comprehensive test to ensure its proper operation.

Highlights

• New Iceberg Transform: Introduced the IcebergAddFiles YAML transform, enabling users to add files to an Iceberg table directly through Beam YAML pipelines.
• Test Coverage: Added a dedicated YAML test file to validate the functionality of the new IcebergAddFiles transform, ensuring it correctly processes and adds files to an Iceberg table.

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