hybrid-array: remove `Array::from_slice` (#1018) #1559

Job	Run time
build (1.41.0, thumbv7em-none-eabi)	14s
build (1.41.0, wasm32-unknown-unknown)	12s
test (1.41.0)	15s
build (stable, thumbv7em-none-eabi)	16s
test (stable)	16s
build (stable, wasm32-unknown-unknown)	17s
minimal-versions / minimal-versions	25s
	1m 55s

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