Struct for NIP-57 Zap Request Data.
Build a new ZapRequestData struct.
@type t() :: %NostrElixir.Nip57.ZapRequestData{ amount: integer() | nil, event_coordinate: String.t() | nil, event_id: String.t() | nil, lnurl: String.t() | nil, message: String.t(), public_key: String.t(), relays: [String.t()] }