Add script to efficiently delete a large number of nested empty folders in an HNS bucket.

[mabsaleh]

Add script to efficiently delete a large number of nested empty folders in an HNS bucket.

See https://cloud.google.com/storage/docs/hns-buckets-best-practices#folder-management for additional context.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

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[gemini-code-assist]

Summary of Changes

Hello @mabsaleh, 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 a new script to efficiently delete a large number of nested empty folders in a Google Cloud Storage (GCS) Hierarchical Namespace (HNS) enabled bucket. The script uses a recursive, depth-first approach with parallel execution to improve performance. The pull request also includes an updated README with instructions on how to use the script.

Highlights

• New script: Added a new Python script, delete-empty-folders.py, to efficiently delete a large number of nested empty folders in a GCS HNS bucket.
• README update: Updated the README.md file to include documentation and usage instructions for the new script.
• Recursive Deletion: The script traverses and deletes nested empty folders using a depth-first approach.
• Parallel Execution: The script uses a thread pool to delete folders concurrently for improved performance.
• Configurable: The script allows setting the target bucket, folder prefix, and number of workers.
• Error Handling: The script includes retry logic for transient errors and logs failures.
• Progress Reporting: The script periodically logs deletion statistics.

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[gemini-code-assist]

Code Review

The pull request introduces a script for efficiently deleting empty folders in GCS HNS buckets. I've provided feedback to correct a typo in the README and to improve the script's configuration validation and error handling.