Support PutObject & Multipart Threshold #78

Job	Run time
clippy	30s
docs	21s
minrust	20s
fmt	10s
basic checks	1s
saniters	2m 26s
features	1m 3s
check-external-types (ubuntu-24.04)	1m 48s
check deps with cargo-deny	18s
Test S3 transfer manager HLL (ubuntu-24.04)	2m 25s
Test S3 transfer manager HLL (windows-2022)	2m 20s
Test S3 transfer manager HLL (macos-14)	2m 28s
Required checks pass	1s
	14m 11s

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