aead: remove stateful AEAD traits (`AeadMut*`) (#1740) #2628

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	19s
build (1.81.0, wasm32-unknown-unknown)	18s
derive (1.81.0)	17s
build (stable, thumbv7em-none-eabi)	16s
derive (stable)	18s
build (stable, wasm32-unknown-unknown)	16s
test (1.81.0)	17s
test (stable)	20s
minimal-versions / minimal-versions	25s
	2m 46s

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