chore(EOF): rename extcall opcode/names #3400

Job	Run time
check serde	22s
check no-default-features	21s
test stable --no-default-features	56s
test stable	1m 1s
test no_std	27s
check std	22s
test stable --all-features	1m 36s
test beta --no-default-features	57s
clippy	1m 27s
docs	1m 14s
test beta	1m 4s
test beta --all-features	1m 33s
fmt	12s
test nightly --no-default-features	55s
test nightly	54s
test nightly --all-features	1m 28s
	14m 49s

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