Implement `zerocopy` traits for `Array` (behind a feature flag) #337

Job	Run time
clippy	22s
careful	1m 3s
rustfmt	10s
miri (x86_64-unknown-linux-gnu)	45s
doc	22s
test (stable)	42s
build (stable, wasm32-unknown-unknown)	55s
miri (s390x-unknown-linux-gnu)	59s
test (1.85.0)	43s
build (stable, thumbv7em-none-eabi)	52s
build (stable, armv7a-none-eabi)	43s
build (1.85.0, wasm32-unknown-unknown)	54s
build (1.85.0, armv7a-none-eabi)	56s
build (1.85.0, thumbv7em-none-eabi)	47s
	10m 13s

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