Add optional dependency on `zerocopy` with impls for `Array` (#162) #338

Job	Run time
careful	1m 3s
rustfmt	8s
doc	20s
clippy	18s
miri (s390x-unknown-linux-gnu)	59s
miri (x86_64-unknown-linux-gnu)	44s
test (1.85.0)	38s
test (stable)	30s
build (1.85.0, wasm32-unknown-unknown)	53s
build (stable, wasm32-unknown-unknown)	48s
build (stable, thumbv7em-none-eabi)	47s
build (1.85.0, thumbv7em-none-eabi)	51s
build (1.85.0, armv7a-none-eabi)	46s
build (stable, armv7a-none-eabi)	50s
	9m 35s

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