inout: add `InOutBufReserved::split_reserved` method (#1133) #738

Job	Run time
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 23s
cross (aarch64-unknown-linux-gnu, stable)	38s
build (1.60.0, armv7a-none-eabi)	1m 54s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 15s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	2m 7s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	22s
build (1.60.0, thumbv7em-none-eabi)	1m 49s
cross (powerpc-unknown-linux-gnu, stable)	44s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	20s
x86 (x86_64-unknown-linux-gnu, stable)	28s
build (1.60.0, wasm32-unknown-unknown)	1m 50s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 49s
build (stable, armv7a-none-eabi)	11s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	15s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 55s
build (stable, thumbv7em-none-eabi)	11s
test (x86_64-apple-darwin, macos-latest, stable)	24s
build (stable, wasm32-unknown-unknown)	11s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 28s
test (x86_64-pc-windows-msvc, windows-latest, stable)	36s
minimal-versions / minimal-versions	1m 0s
	23m 50s

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