feat(provider): OP engine api trait ext + superchain signal type #409

Job	Run time
clippy	23s
doctest	36s
docs	19s
cfg-check	17s
feature-checks	48s
feature-powerset	1m 4s
fmt	11s
no-std	20s
test stable --no-default-features	25s
wasm-unknown	30s
wasm-wasi	25s
test stable	38s
test stable --all-features	52s
test nightly --no-default-features	28s
test nightly	28s
test nightly --all-features	59s
test 1.81 --no-default-features	35s
test 1.81	36s
	9m 54s

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