sendTransaction method
Sign and send a transaction described by txParams (EIP-1193
eth_sendTransaction params: from, to, value, data, gas, ...).
Should return the transaction hash hex string.
Implementation
@override
Future<String> sendTransaction(Map<String, dynamic> txParams) {
final handler = TransactionHandler(
_getClient(),
_credentials,
_getChainId(),
);
return handler.handleTransaction(txParams);
}