pkcs8

[WIP] der: remove lifetime from `BitStringRef` [BREAKING] #4781

Job	Run time
test (stable)	1m 7s
build (stable, wasm32-unknown-unknown)	38s
test (1.85.0)	1m 49s
build (1.85.0, wasm32-unknown-unknown)	40s
build (1.85.0, thumbv7em-none-eabi)	1m 2s
minimal-versions / minimal-versions	39s
build (stable, thumbv7em-none-eabi)	1m 49s
	7m 44s

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