chore(storage): add configurations and defaults for PCU feature

[cpriti-os]

[gemini-code-assist[bot]]

Summary of Changes

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This pull request lays the groundwork for the Parallel Composite Upload (PCU) feature by introducing its core configuration structures and establishing default values. It defines how various aspects of parallel uploads, such as part sizing, concurrency, retry mechanisms, and temporary object cleanup, can be configured. The changes aim to provide a flexible yet easy-to-use setup for PCU, ensuring that the feature is both powerful and accessible to developers.

Highlights

• Parallel Composite Upload (PCU) Configuration: Introduced the ParallelUploadConfig struct to define comprehensive settings for the new Parallel Composite Upload (PCU) feature, enabling fine-grained control over upload behavior.
• Default Values and Heuristics: Implemented a defaults() method for ParallelUploadConfig that automatically sets sensible default values for all parameters, including a heuristic for NumWorkers based on CPU count, simplifying initial setup while allowing customization.
• Extensible Strategies: Defined interfaces such as PartNamingStrategy and PartMetadataDecorator to allow for custom logic in naming temporary parts and decorating their metadata, providing flexibility for advanced use cases.
• Robust Testing: Added comprehensive unit tests for the new configuration structures and their default behaviors, ensuring correctness and stability of the PCU feature's foundational elements.

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