refactor: make ChainSpec associated type on EvmWiring #4309

Job	Run time
check	21s
check no_std	22s
check serde	21s
clippy	46s
check no_std kzg-rs	25s
check std	17s
docs	43s
fmt	7s
test stable --no-default-features	31s
TyposCheck	4s
test stable	4s
test stable --all-features	5s
test beta --no-default-features	43s
test beta	45s
test beta --all-features	44s
test nightly --no-default-features	16s
test nightly	32s
test nightly --all-features	31s
	7m 37s

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