Add mechanism to cancel the operation of downloading objects #166

Job	Run time
clippy	2m 1s
minrust	1m 10s
fmt	22s
docs	1m 13s
basic checks	1s
check deps with cargo-deny	21s
check-external-types (ubuntu-24.04)	1m 6s
saniters	4m 12s
features	1m 34s
Test S3 transfer manager HLL (ubuntu-24.04)	3m 18s
Test S3 transfer manager HLL (windows-2022)	4m 29s
Test S3 transfer manager HLL (macos-14)	2m 50s
Required checks pass	1s
	22m 38s

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