consensus over t8n res cancun field names

```
 "blobGasUsed": "0x0",
 "currentBaseFee": "0xe",
 "withdrawalsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
 "currentExcessBlobGas": "0x0"
```

so we have different notations here mixed. 
blobGasUsed vs currentBlobGasUsed
and excessBlobGas vs curentExcessBlobGas  

there is a lot of confustion with nimbus. 