Implement `zerocopy` traits for `Array` (behind a feature flag) #336

Job	Run time
careful	1m 4s
miri (s390x-unknown-linux-gnu)	59s
test (stable)	32s
clippy	21s
doc	20s
miri (x86_64-unknown-linux-gnu)	42s
rustfmt	7s
test (1.85.0)	41s
build (1.85.0, armv7a-none-eabi)	50s
build (1.85.0, wasm32-unknown-unknown)	53s
build (1.85.0, thumbv7em-none-eabi)	46s
build (stable, armv7a-none-eabi)	58s
build (stable, wasm32-unknown-unknown)	51s
build (stable, thumbv7em-none-eabi)	45s
	9m 49s

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