cmpv2

sec1: migrate from `generic-array` to `hybrid-array` #889

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 45s
test (1.65.0)	9m 29s
build (1.65.0, wasm32-unknown-unknown)	1m 54s
test (stable)	7m 28s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	30s
minimal-versions / minimal-versions	5m 33s
	27m 5s

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