Implement consensus-specs/3875 (#14458)

* WIP

- beacon-chain builds

* pass blockchain tests

* pass beacon-chain/execution tests

* Passing RPC tests

* fix building

* add changelog

* fix linters

* Spectests

* copy requests on Copy()

* Fix tests

* Fix config test

* fix verification tests

* add aliases for Electra types

* double import and unskip spectests

* Remove unnecessary comment

beacon-chain/state/state-native/getters_state.go

@@ -198,7 +198,7 @@ func (b *BeaconState) ToProtoUnsafe() interface{} {
 			InactivityScores:              b.inactivityScoresVal(),
 			CurrentSyncCommittee:          b.currentSyncCommittee,
 			NextSyncCommittee:             b.nextSyncCommittee,
-			LatestExecutionPayloadHeader:  b.latestExecutionPayloadHeaderElectra,
+			LatestExecutionPayloadHeader:  b.latestExecutionPayloadHeaderDeneb,
 			NextWithdrawalIndex:           b.nextWithdrawalIndex,
 			NextWithdrawalValidatorIndex:  b.nextWithdrawalValidatorIndex,
 			HistoricalSummaries:           b.historicalSummaries,
@@ -404,7 +404,7 @@ func (b *BeaconState) ToProto() interface{} {
 			InactivityScores:              b.inactivityScoresVal(),
 			CurrentSyncCommittee:          b.currentSyncCommitteeVal(),
 			NextSyncCommittee:             b.nextSyncCommitteeVal(),
-			LatestExecutionPayloadHeader:  b.latestExecutionPayloadHeaderElectra.Copy(),
+			LatestExecutionPayloadHeader:  b.latestExecutionPayloadHeaderDeneb.Copy(),
 			NextWithdrawalIndex:           b.nextWithdrawalIndex,
 			NextWithdrawalValidatorIndex:  b.nextWithdrawalValidatorIndex,
 			HistoricalSummaries:           b.historicalSummariesVal(),