perf(precompile): use secp256k1 global context for ecrecover #4472

Job	Run time
check no_std	31s
check	25s
clippy	1m 24s
check no_std kzg-rs	35s
check serde	31s
check std	27s
docs	1m 7s
test stable --no-default-features	54s
test stable	51s
fmt	6s
test stable --all-features	1m 14s
test beta --no-default-features	1m 59s
TyposCheck	8s
test beta	2m 3s
test beta --all-features	2m 8s
test nightly --no-default-features	1m 53s
test nightly	1m 50s
test nightly --all-features	1m 59s
	20m 5s

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