Add `Array::slice_as_(mut_)array` #351

Job	Run time
miri (s390x-unknown-linux-gnu)	1m 0s
careful	1m 0s
clippy	18s
rustfmt	11s
doc	25s
test (1.85.0)	41s
miri (x86_64-unknown-linux-gnu)	44s
build (stable, thumbv7em-none-eabi)	45s
build (1.85.0, armv7a-none-eabi)	46s
build (1.85.0, wasm32-unknown-unknown)	52s
build (stable, wasm32-unknown-unknown)	49s
test (stable)	44s
build (stable, armv7a-none-eabi)	43s
build (1.85.0, thumbv7em-none-eabi)	53s
	9m 51s

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