inout

inout: add `InOut::into_out` and `InOutBufReserved::into_out` #655

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	15s
test (1.81.0)	13s
build (1.81.0, wasm32-unknown-unknown)	17s
test (stable)	26s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	9s
minimal-versions / minimal-versions	38s
	2m 9s

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