external RPCDaemon: to use same engine variable logic creation - as in backend.go

[AskAlexSharov]

I found that external RPCDaemon using custom logic/methods to open engine db and create engine object. Need re-use logic (and don't loose .Accede() when opening databases from external rpcdaemon)

on Gnosis: next request doesn't work if optimize=false and works if optimize=true:

 curl -X POST http://localhost:8549 -H 'Content-Type: application/json' -d '{"jsonrpc": "2.0", "method": "eth_getTransactionReceipt", "params": ["0x7fb21774eed37fa229d59cdf4b991f951aee185066d86b432ed1cc1e29764577"], "id": 293}'

for: #12247

error message is:

WARN[10-22|08:12:17.321] [rpc] served                             conn=127.0.0.1:35698 method=eth_getTransactionReceipt reqid=293 err="getReceipt error: ReceiptGen.GetReceipt: bn=19040024, txnIdx=0, fee cap less than block base fee: address 0x67342Ec1440bFB760Ba9805a7735e0D12Bb9fEc7, gasFeeCap: 0 baseFee: 141015840"