perf(precompile): use secp256k1 global context for ecrecover #4475

Job	Run time
check no_std	28s
test stable --no-default-features	1m 4s
check no_std optimism,kzg-rs	32s
test stable	59s
test stable --all-features	1m 46s
test beta --no-default-features	2m 27s
test beta	2m 17s
test beta --all-features	2m 42s
clippy	1m 31s
docs	1m 25s
test nightly --no-default-features	2m 10s
check	24s
test nightly	2m 5s
check serde	27s
fmt	14s
test nightly --all-features	2m 26s
TyposCheck	4s
check std	25s
	23m 26s

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