BLUE-70: Fix issue in eth_getBalance and eth_getTransactionCount

[Glitch18]

https://linear.app/shm/issue/BLUE-70/rpc-bugs-in-eth-getbalance-and-eth-gettransactioncount

I came across two issues on the RPC level where for accounts that have not been initialized, calls eth_getTransactionCount and eth_getBalance fail on an nLDRPC.

Example with nLDRPC of a dev network:

$: curl -X POST -H "Content-Type: application/json" --data '{"method":"eth_getTransactionCount","params":["0xc8f59951039673bD22aCA3aCa16E42ebb61D5C16"],"id":1,"jsonrpc":"2.0"}' http://34.71.92.251:8090

{"jsonrpc":"2.0","id":1,"error":{"code":-32001,"message":"Unable to get transaction count"}}%

Adds a fix for both

[linear]

BLUE-70 RPC bugs in `eth_getBalance` and `eth_getTransactionCount`