sendToDeviceUnsafe
abstract suspend fun <C : ToDeviceEventContent> sendToDeviceUnsafe(events: Map<UserId, Map<String, C>>, transactionId: String = Random.nextString(22)): Result<Unit>
abstract suspend fun sendToDeviceUnsafe(type: String, events: Map<UserId, Map<String, ToDeviceEventContent>>, transactionId: String = Random.nextString(22)): Result<Unit>