Use `BlockCipherEncrypt`/`BlockCipherDecrypt` trait names (#400) #757

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 20s
build (1.65.0, wasm32-unknown-unknown)	2m 20s
test (1.65.0)	2m 23s
build (stable, thumbv7em-none-eabi)	19s
test (stable)	15s
build (stable, wasm32-unknown-unknown)	11s
minimal-versions / minimal-versions	23s
	8m 11s

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