feat(l2-withdrawals): Impl conversion to block for `OpExecutionPayloadV4` #1397

Job	Run time
docs	1m 6s
cfg-check	54s
clippy	15s
doctest	17s
examples	12s
feature-powerset	1m 28s
feature-checks	35s
fmt	16s
no-std	13s
test stable --no-default-features	34s
wasm-unknown	21s
wasm-wasi	24s
test stable	26s
test stable --all-features	54s
test nightly --no-default-features	1m 12s
test nightly	1m 11s
test nightly --all-features	1m 24s
test 1.81 --no-default-features	37s
test 1.81	36s
	12m 55s

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