aead: extract STREAM implementation into `aead-stream` #1226

Job	Run time
build (1.66.0, thumbv7em-none-eabi)	45s
test (1.66.0)	1m 13s
build (1.66.0, wasm32-unknown-unknown)	49s
test (stable)	29s
build (stable, thumbv7em-none-eabi)	6s
build (stable, wasm32-unknown-unknown)	18s
	3m 40s

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