Add docstring for PGBKCVOperations

[Subramanya-Veeregowda]

Added a descriptive docstring for PGBKCVOperation to clarify its purpose and behaviour.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the clarity and maintainability of the codebase by providing a detailed docstring for the PGBKCVOperation class. This documentation clarifies the class's role in the Apache Beam execution model, specifically its function in optimizing data processing through partial grouping and aggregation, which is crucial for developers understanding internal Beam mechanisms.

Highlights

• Documentation: Added a comprehensive docstring to the PGBKCVOperation class, explaining its purpose as a Partial GroupByKey with Combine Values step, its function in grouping and partial aggregation, and its internal use for efficiency in Beam runners.

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