core, params, beacon/engine: implement EIP 4788 BeaconRoot (#27849)

This change implements "EIP 4788 : Beacon block root in the EVM". It implements version-2 of EPI-4788, main difference being that the contract is an actual contract rather than a precompile, as in #27289.

beacon/engine/types.go

@@ -226,6 +226,7 @@ func ExecutableDataToBlock(params ExecutableData, versionedHashes []common.Hash)
 		WithdrawalsHash: withdrawalsRoot,
 		ExcessBlobGas:   params.ExcessBlobGas,
 		BlobGasUsed:     params.BlobGasUsed,
+		// TODO BeaconRoot
 	}
 	block := types.NewBlockWithHeader(header).WithBody(txs, nil /* uncles */).WithWithdrawals(params.Withdrawals)
 	if block.Hash() != params.BlockHash {
@@ -255,6 +256,7 @@ func BlockToExecutableData(block *types.Block, fees *big.Int, blobs []kzg4844.Bl
 		Withdrawals:   block.Withdrawals(),
 		BlobGasUsed:   block.BlobGasUsed(),
 		ExcessBlobGas: block.ExcessBlobGas(),
+		// TODO BeaconRoot
 	}
 	blobsBundle := BlobsBundleV1{
 		Commitments: make([]hexutil.Bytes, 0),