Better EIP-1898 support

[Termina1]

Nethermind nodes does doesn't handle blockNumber argument from EIP-1898 draft.
https://eips.ethereum.org/EIPS/eip-1898

Steps to reproduce
If you send request:

{
  "method": "eth_getBalance",
  "params": ["0xdefe33795803f2353c69fd8cdb432f9d5cee6762", {
    "blockNumber": "latest"
  }],
  "id": "101",
  "jsonrpc": "2.0"
}

You will get BlockHash could not be found error.

Expected behavior
Interpret it the same way as

{
  "method": "eth_getBalance",
  "params": ["0xdefe33795803f2353c69fd8cdb432f9d5cee6762", "latest"],
  "id": "101",
  "jsonrpc": "2.0"
}

[kamilchodola]

Is it still valid? This EIP is Stagnant and not sure if we should adjust to it
@LukaszRozmej wdyt?