x509-ocsp: remove lifetimes and implement `AsExtension` (#1241) #884

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	5m 58s
build (1.65.0, wasm32-unknown-unknown)	4m 56s
build (stable, thumbv7em-none-eabi)	21s
build (stable, wasm32-unknown-unknown)	17s
test (1.65.0)	5m 9s
test (stable)	35s
minimal-versions / minimal-versions	1m 7s
	18m 23s

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