Google Pay

[NicholasG04]

Add GPay support for the QR tickets

[NicholasG04]

Google Pay objects hereto:

{ // EventTicketObject
  "ticketHolderName": string,
  "ticketNumber": string, // should we generate UUIDs rather than just numbers? Might be a better idea
  "id": string, // issuerID.identifier, we need to pick the identifier which can just be that UUID
  "classId": string, // issuerID.identifier
  "state": "ACTIVE",
  "barcode": {
    "type": "QR_CODE",
    "value": string, // JWT
    "alternateText": string // chuck the name - UUID there so we can check it in the db if barcode doesn't work
  }
}

{ // EventTicketClass
  "eventName": "Kimberley College Prom",
  "eventId": string, // just a UUID....?
  "logo": object (Image),
  "venue": object (EventVenue),
  "dateTime": object (EventDateTime),
  "finePrint": object (LocalizedString), // terms of sale?
  "id": string, // same UUID? one used in EventTicketObject
  "issuerName": "Kimberley College Prom 2022",
  "locations[]": object (LatLongPoint),
  "reviewStatus": "draft" || "underReview" || "approved", // underReview goes to approved automatically
  "heroImage": object (Image), // banner
}