[WIP] der: remove lifetime from `BitStringRef` [BREAKING] #2467

Job	Run time
build (stable, wasm32-unknown-unknown)	30s
test (1.85.0)	26s
build (1.85.0, wasm32-unknown-unknown)	28s
build (1.85.0, thumbv7em-none-eabi)	28s
test (stable)	29s
build (stable, thumbv7em-none-eabi)	28s
minimal-versions	-1s
	2m 48s

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