feat: Pr 839 s3 download checkpoint resume and unittest for s3 download

[Dludora]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @Dludora, 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 introduces robust S3 integration capabilities by adding dedicated mappers for downloading and uploading files to and from Amazon S3 (or S3-compatible storage). These new operators enable seamless data transfer for processing pipelines, offering features like concurrent operations, resume functionality for downloads, and flexible handling of S3 credentials and endpoints. The changes are accompanied by an example workflow and comprehensive unit tests to ensure reliability and ease of use.

Highlights

• New S3 Download Mapper: Introduced a new S3DownloadFileMapper to facilitate downloading files from S3. This mapper supports concurrent downloads, saving files to a local directory or loading their content directly into memory, and includes a resume download feature to skip already existing local files. It also handles S3 authentication and custom endpoints.
• New S3 Upload Mapper: Added a new S3UploadFileMapper for uploading local files to S3. This mapper supports concurrent uploads, updates file paths in the dataset to their corresponding S3 URLs, offers optional deletion of local files after successful upload, and can skip files that already exist in S3.
• S3 Workflow Example: A new example configuration file (s3_video_processing_config.yaml) and a sample dataset (demo-dataset-s3.jsonl) have been added to demonstrate an end-to-end video processing workflow that involves downloading videos from S3, processing them locally, and then uploading the processed videos back to S3.
• Unit Tests for S3 Download: Comprehensive unit tests have been added for the S3DownloadFileMapper, covering various scenarios such as downloading to a local directory, loading content into memory, verifying the resume download logic, and handling S3 download failures.
• Documentation Update: The docs/Operators.md file has been updated to include the newly added s3_download_file_mapper and s3_upload_file_mapper, making them discoverable in the project's documentation.

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[gemini-code-assist]

Code Review

This pull request introduces two new mappers, S3DownloadFileMapper and S3UploadFileMapper, for handling file transfers with S3. It also includes unit tests for the download mapper and a comprehensive demo configuration. The implementation of both mappers is robust, featuring asynchronous operations for performance, lazy loading of S3 clients, and good error handling.

My review focuses on improving consistency, clarity, and correctness. I've suggested using lazy loading for boto3 in the upload mapper to align with the download mapper, removing a confusing and unused parameter, and fixing a path in the demo configuration that would cause it to fail. I also pointed out a minor redundancy in the code. Overall, this is a great addition to the project's capabilities.