Summary of Changes

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This pull request enhances the asynchronous write functionality for Google Cloud Storage by introducing robust management of the write_handle during appendable object uploads. The changes ensure that the client correctly tracks and utilizes the latest write handle provided by the service, which is critical for maintaining upload state and enabling features like resuming uploads. This involves modifications to the core AsyncWriterConnection interface and its various concrete implementations, along with new tests to verify the behavior.

Highlights

• AsyncWriterConnection Interface Extension: A new virtual method, WriteHandle(), has been added to the AsyncWriterConnection interface, allowing retrieval of the latest write handle during an upload operation.
• Write Handle Management in PartialUpload: The PartialUpload mechanism now explicitly clears write_object_spec, append_object_spec, and upload_id fields after the initial message in a multi-part upload. This ensures correct protocol behavior for subsequent data chunks, preventing unintended re-transmission of initial metadata.
• Write Handle Propagation and Update: The latest_write_handle_ member is now correctly updated from the RPC response in AsyncWriterConnectionImpl::OnQuery and propagated through AsyncWriterConnectionBuffered and AsyncWriterConnectionResumed implementations, maintaining the current state of the upload.
• New Test Cases for Write Handle Logic: Dedicated test cases, ClearsSpecAfterFirstChunk and OnQueryUpdatesWriteHandle, have been added to validate the correct clearing of request fields and the updating of the write handle during appendable object uploads, ensuring the new logic behaves as expected.

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