ctr

Implement `SetIvState` trait #30

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	19s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	14s
build (1.85.0, thumbv7em-none-eabi)	18s
test (1.85.0)	40s
test (stable)	37s
minimal-versions / minimal-versions	25s
	2m 41s

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