Sync: upload/delete S3 files concurrently, not one directory call#3650

reakaleek wants to merge 3 commits into

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aws-s3-sync-concurrency-analysis-how-aws-s3-sync-w/o-bound-not-cpu-bound-opportunity-most-systems-caelastic/docs-builder:aws-s3-sync-concurrency-analysis-how-aws-s3-sync-w/o-bound-not-cpu-bound-opportunity-most-systems-caCopy head branch name to clipboard