support vectored IO (#1502) #2258

Job	Run time
rustfmt	6s
Check unused dependencies (ubuntu-latest)	3m 50s
cargo-deny check	22s
codegen	25s
Check unused dependencies (macOS-latest)	7m 55s
check (ubuntu-latest)	1m 12s
Check unused dependencies (windows-latest)	6m 4s
Interop Tests (ubuntu-latest)	40s
check (macOS-latest)	1m 38s
Check MSRV	48s
Interop Tests (macOS-latest)	56s
check (windows-latest)	2m 58s
test (ubuntu-latest)	2m 49s
Interop Tests (windows-latest)	2m 17s
test (macOS-latest)	2m 24s
test (windows-latest)	4m 2s
	38m 26s

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