aead: extract STREAM implementation into `aead-stream` #2100

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	48s
minimal-versions	24s
build (1.65.0, wasm32-unknown-unknown)	49s
test (1.65.0)	54s
build (stable, thumbv7em-none-eabi)	24s
test (stable)	11s
build (stable, wasm32-unknown-unknown)	9s
	3m 39s

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