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x509-cert: rename helpers to `get_extension`/`filter_extensions` (#1497) #3092

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	34s
minimal-versions	0s
test (1.72.0)	1m 16s
build (1.72.0, wasm32-unknown-unknown)	39s
build (stable, thumbv7em-none-eabi)	37s
test (stable)	1m 17s
build (stable, wasm32-unknown-unknown)	38s
	5m 1s

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