feat(experimental): flush the last chunk in append method

[Pulkit0110]

Earlier the last chunk was being flushed while calling the close() method. Now it will be done inside the append method itself.

[gemini-code-assist]

Summary of Changes

Hello @Pulkit0110, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the asynchronous object writing mechanism to improve data persistence guarantees. By shifting the responsibility of flushing the final data chunk from the close() method to the append() method, data is now persisted more promptly. This change streamlines the write process, ensures that all data sent via append() is immediately accounted for, and simplifies the overall state management of the object writer.

Highlights

• Flushing Logic Relocation: The mechanism for flushing the last data chunk has been moved from the close() method directly into the append() method, ensuring immediate persistence of the final segment of data.
• Enhanced Append Method: The append() method now explicitly sets flush=True and state_lookup=True on the gRPC request for the last chunk of data being sent, providing more granular control over data persistence and state updates.
• Simplified Close Method: The close() method has been simplified by removing the explicit flush call when finalize_on_close is false, as this responsibility is now handled by the append() method.
• Stream Management in Finalize: The finalize() method now includes the logic for closing the underlying write stream and resetting the writer's internal state, centralizing stream cleanup when an object is finalized.
• Comprehensive Test Coverage: New system tests and updated unit tests have been added to thoroughly validate the revised flushing behavior and stream management within the AsyncAppendableObjectWriter.

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[gemini-code-assist]

Code Review

This pull request refactors the AsyncAppendableObjectWriter to flush the last chunk of data within the append method itself, rather than waiting for the close method. This change improves the writer's behavior by ensuring data is persisted more promptly. The implementation correctly handles flushing based on both the flush interval and whether a chunk is the last in an append call. The close and finalize methods have been updated to reflect this new behavior, and the stream is now correctly closed within finalize. The accompanying test changes, including a new system test, effectively validate the new logic. I have one suggestion to slightly refactor the flushing logic for improved clarity.