matrixServerServerApiServer
fun Application.matrixServerServerApiServer(hostname: String, signatureAuthenticationFunction: SignatureAuthenticationFunction, roomVersionStore: RoomVersionStore, eventContentSerializerMappings: EventContentSerializerMappings = EventContentSerializerMappings.default, json: Json = createMatrixEventAndDataUnitJson(roomVersionStore, eventContentSerializerMappings), routes: Route.() -> Unit)