Get an attendee by its plaintext ticket token, or null. Ticket tokens are
unique, so this matches at most one attendee. Backs the admin API create's
idempotent retry: the attendee under the retried token is returned as it
reads now.
Parameters
token: string
Return Type
Promise<Attendee | null>
Usage
import { getAttendeeRawByToken } from "docs/database.ts";