Use `BlockCipherEncrypt`/`BlockCipherDecrypt` trait names #756

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 24s
test (1.65.0)	2m 24s
build (1.65.0, wasm32-unknown-unknown)	2m 20s
test (stable)	27s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	18s
minimal-versions / minimal-versions	23s
	8m 29s

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