hybrid-array: impl `IntoIterator` for all `ArraySize`s (#956) #964

Job	Run time
cross (aarch64-unknown-linux-gnu, stable)	57s
macos (stable)	40s
linux (i686-unknown-linux-gnu, 1.40.0, sudo apt update && sudo apt install gcc-multilib)	4m 9s
windows (x86_64-pc-windows-gnu, stable)	1m 1s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 0s
linux (x86_64-unknown-linux-gnu, 1.40.0)	3m 36s
linux (x86_64-unknown-linux-gnu, stable)	19s
minimal-versions / minimal-versions	28s
	12m 10s

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