Electra: BeaconState implementation (#13919)

* Electra: Beacon State

* Electra: Beacon state fixes from PR 13919

* Add missing tests - part 1

* Split eip_7251_root.go into different files and reuse/share code with historical state summaries root. It's identical!

* Add missing tests - part 2

* deposit receipts start index getters and setters (#13947)

* adding in getters and setters for deposit receipts start index

* adding tests

* gaz

* Add missing tests - part 3 of 3

Update the electra withdrawal example with a ssz state containing pending partial withdrawals

* add tests for beacon-chain/state/state-native/getters_balance_deposits.go

* Add electra field to testing/util/block.go execution payload

* godoc commentary on public methods

* Fix failing test

* Add balances index out of bounds check and relevant tests.

* Revert switch case electra

* Instead of copying spectest data into testdata, use the spectest dependency

* Deepsource fixes

* Address @rkapka PR feedback

* s/MaxPendingPartialsPerWithdrawalSweep/MaxPendingPartialsPerWithdrawalsSweep/

* Use multivalue slice compatible accessors for validator and balance in ActiveBalanceAtIndex

* More @rkapka feedback. What a great reviewer!

* More tests for branching logic in ExitEpochAndUpdateChurn

* fix build

---------

Co-authored-by: james-prysm <90280386+james-prysm@users.noreply.github.com>

testing/util/deneb.go

@@ -2,7 +2,6 @@ package util
 
 import (
 	"encoding/binary"
-	"math"
 	"math/big"
 	"testing"
 
@@ -187,19 +186,3 @@ func ExtendBlocksPlusBlobs(t *testing.T, blks []blocks.ROBlock, size int) ([]blo
 
 	return blks, blobs
 }
-
-// HackDenebMaxuint is helpful for tests that need to set up cases where the deneb fork has passed.
-// We have unit tests that assert our config matches the upstream config, where the next fork is always
-// set to MaxUint64 until the fork epoch is formally set. This creates an issue for tests that want to
-// work with slots that are defined to be after deneb because converting the max epoch to a slot leads
-// to multiplication overflow.
-// Monkey patching tests with this function is the simplest workaround in these cases.
-func HackDenebMaxuint(t *testing.T) func() {
-	bc := params.MainnetConfig().Copy()
-	bc.DenebForkEpoch = math.MaxUint32
-	undo, err := params.SetActiveWithUndo(bc)
-	require.NoError(t, err)
-	return func() {
-		require.NoError(t, undo())
-	}
-}