hybrid-array: rename `ArrayExt` to `FromFn` (#1009) #407

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	1m 19s
build (1.60.0, wasm32-unknown-unknown)	1m 19s
cross (aarch64-unknown-linux-gnu, 1.60.0)	1m 49s
build (stable, thumbv7em-none-eabi)	15s
cross (aarch64-unknown-linux-gnu, stable)	42s
build (stable, wasm32-unknown-unknown)	19s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	1m 26s
cross (powerpc-unknown-linux-gnu, 1.60.0)	1m 44s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 22s
cross (powerpc-unknown-linux-gnu, stable)	38s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	1m 51s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 50s
minimal-versions / minimal-versions	20s
	14m 54s

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