hybrid-array: implement concat and split methods (#958) #443

Job	Run time
aarch64 (aarch64-unknown-linux-gnu, 1.60.0)	4m 38s
aarch64 (aarch64-unknown-linux-gnu, stable)	54s
build (1.60.0, armv7a-none-eabi)	4m 7s
build (1.60.0, thumbv7em-none-eabi)	4m 1s
build (1.60.0, wasm32-unknown-unknown)	3m 55s
cross (powerpc-unknown-linux-gnu, 1.60.0)	4m 29s
build (stable, armv7a-none-eabi)	21s
cross (powerpc-unknown-linux-gnu, stable)	44s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	18s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	4m 31s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	1m 5s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	4m 8s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	26s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	4m 43s
test (x86_64-apple-darwin, macos-latest, stable)	49s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	5m 22s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 12s
minimal-versions / minimal-versions	1m 7s
	47m 8s

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