aead: remove stateful AEAD traits (`AeadMut*`) (#1740) #2571

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	18s
test (1.81.0)	19s
build (1.81.0, wasm32-unknown-unknown)	15s
test (stable)	16s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	16s
	1m 39s

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