x509-ocsp: remove lifetimes and implement `AsExtension` (#1241) #721

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	4m 44s
build (1.65.0, wasm32-unknown-unknown)	4m 55s
build (stable, thumbv7em-none-eabi)	26s
test (1.65.0)	5m 13s
build (stable, wasm32-unknown-unknown)	26s
test (stable)	29s
minimal-versions / minimal-versions	47s
	17m 0s

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