support checking for object modified during download #213

Job	Run time
clippy	31s
minrust	29s
docs	31s
fmt	7s
basic checks	1s
check deps with cargo-deny	10s
features	41s
saniters	2m 10s
check-external-types (ubuntu-24.04)	30s
Test S3 transfer manager HLL (ubuntu-24.04)	1m 34s
Test S3 transfer manager HLL (windows-2022)	3m 44s
Test S3 transfer manager HLL (macos-14)	1m 9s
Required checks pass	1s
	11m 38s

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