der: conversions from `OctetString(Ref)` to `Vec`/`Bytes` (#1540) #1982

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	54s
build (1.65.0, wasm32-unknown-unknown)	56s
test (1.65.0)	58s
build (stable, thumbv7em-none-eabi)	10s
test (stable)	10s
build (stable, wasm32-unknown-unknown)	10s
minimal-versions / minimal-versions	25s
	3m 43s

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