ethclient: include withdrawals in ethclient block responses (#26778)

* include withdrawals in ethclient responses

* omit empty withdrawals array in json serialization

ethclient/ethclient.go

@@ -105,6 +105,7 @@ type rpcBlock struct {
 	Hash         common.Hash         `json:"hash"`
 	Transactions []rpcTransaction    `json:"transactions"`
 	UncleHashes  []common.Hash       `json:"uncles"`
+	Withdrawals  []*types.Withdrawal `json:"withdrawals,omitempty"`
 }
 
 func (ec *Client) getBlock(ctx context.Context, method string, args ...interface{}) (*types.Block, error) {
@@ -169,7 +170,7 @@ func (ec *Client) getBlock(ctx context.Context, method string, args ...interface
 		}
 		txs[i] = tx.tx
 	}
-	return types.NewBlockWithHeader(head).WithBody(txs, uncles), nil
+	return types.NewBlockWithHeader(head).WithBody(txs, uncles).WithWithdrawals(body.Withdrawals), nil
 }
 
 // HeaderByHash returns the block header with the given hash.