Add fiuu google pay gateway name

[srujanchikke]

currently googlepay.metadata gateway names are hardcoded for few connectors as per googlepay documentation.
Same needs to done for fiuu(connector).

let getCustomGateWayName = connector => {
  open ConnectorUtils
  open ConnectorTypes
  switch connector->getConnectorNameTypeFromString {
  | Processors(CHECKOUT) => "checkoutltd"
  | Processors(NUVEI) => "nuveidigital"
  | Processors(AUTHORIZEDOTNET) => "authorizenet"
  | Processors(GLOBALPAY) => "globalpayments"
  | Processors(BANKOFAMERICA) | Processors(CYBERSOURCE) => "cybersource"
  | _ => connector
  }
}

gateway name details
processor : fiuu
gateway : "molpay"