hybrid-array: impl `IntoIterator` for references to all `ArraySize`s … #1488

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 47s
test (1.56.0)	3m 43s
build (1.56.0, wasm32-unknown-unknown)	4m 28s
build (stable, thumbv7em-none-eabi)	22s
test (stable)	18s
build (stable, wasm32-unknown-unknown)	19s
minimal-versions / minimal-versions	25s
	13m 22s

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