Expose Download Metadata for Every Chunk #159

Job	Run time
clippy	1m 5s
fmt	20s
docs	1m 1s
minrust	55s
basic checks	1s
features	55s
check-external-types (ubuntu-24.04)	1m 42s
check deps with cargo-deny	15s
saniters	3m 33s
Test S3 transfer manager HLL (ubuntu-24.04)	2m 6s
Test S3 transfer manager HLL (windows-2022)	3m 26s
Test S3 transfer manager HLL (macos-14)	2m 31s
Required checks pass	1s
	17m 51s

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