aead: extract STREAM implementation into `aead-stream` #1767

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	48s
build (1.65.0, wasm32-unknown-unknown)	44s
test (1.65.0)	49s
build (stable, thumbv7em-none-eabi)	13s
test (stable)	10s
build (stable, wasm32-unknown-unknown)	14s
minimal-versions / minimal-versions	20s
	3m 18s

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