hybrid-array: Added serde impls for `Array` #1005

Job	Run time
linux (i686-unknown-linux-gnu, 1.40.0, sudo apt update && sudo apt install gcc-multilib)	5m 7s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	51s
linux (x86_64-unknown-linux-gnu, 1.40.0)	5m 17s
linux (x86_64-unknown-linux-gnu, stable)	15s
macos (stable)	28s
build-only	28s
cross (aarch64-unknown-linux-gnu, stable)	56s
windows (x86_64-pc-windows-gnu, stable)	1m 34s
minimal-versions / minimal-versions	34s
	15m 30s

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