feat: generate genesis UTxOs from config files

[scarmuega]

This PR provides a way to load Byron json config files and generate the corresponding genesis UTxOs from the data.

use pallas::ledger::configs::byron;

let config = byron::from_file(&path).unwrap();
let utxos = byron::genesis_utxos(&config);

for (tx_hash, address, amount) in utxos {
  format!("{tx_hash} - {address} - {amount}");
}