Expose Download Metadata for Every Chunk #138

Job	Run time
fmt	14s
clippy	2m 5s
docs	1m 10s
minrust	1m 15s
basic checks	1s
check deps with cargo-deny	18s
saniters	3m 58s
check-external-types (ubuntu-24.04)	1m 48s
features	1m 9s
Test S3 transfer manager HLL (ubuntu-24.04)	3m 4s
Test S3 transfer manager HLL (windows-2022)	4m 13s
Test S3 transfer manager HLL (macos-14)	2m 38s
Required checks pass	1s
	21m 54s

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