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feat: stock Engine API payloads; read timestampMillisPart from extraData - #469
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Follows seismic-reth (SeismicSystems/seismic-reth#512).
Seismic headers are stock Ethereum headers and the sub-second block time is the two-byte big-endian prefix of
extraData(0..1000).Changes:
ExecutionPayloadV3(block SSZ and the header's payload_hash change accordingly)payload_timestamp_millis()reconstructs seconds * 1000 + prefix and fails on a malformed layoutpayload_with_timestamp_millis()stamps a block time into a payload for mocks/testshandle_verifybinds the payload's seconds +extraDataprefix to the Summit header timestamp and rejects a missing or out-of-range prefixgetPayloadV4/newPayloadV4use stock envelope/payload typesforkchoiceUpdatedV3keepsSeismicPayloadAttributes(timestampMillisPart), the only non-stock Engine API type leftverify-consensus-state-proofreads the millisecond timestamp from the RPC header'sextraData(thetimestampMillisPartfield is gone)reth-seismic-engine-typesis now only needed by typesexample_genesis.toml: dev eth_genesis_hash -> 0xa311e08b…TODO: Re-pinreth-seismic-engine-typesafter merging the seismic-reth PR.