Add BLE and USB support for Flex and Stax

import { DeviceManagementKitBuilder } from "@ledgerhq/device-management-kit";
import { webBleTransportFactory } from "@ledgerhq/device-transport-kit-web-ble";
import { webHidTransportFactory } from "@ledgerhq/device-transport-kit-web-hid";
 
const dmk = new DeviceManagementKitBuilder()
  .addTransport(webBleTransportFactory)
  .addTransport(webHidTransportFactory)
  .build();

import TransportBLE from "@ledgerhq/hw-transport-web-ble";
import TransportUSB from "@ledgerhq/hw-transport-web-usb";
 
// Example of connecting to a device via BLE
const transportBLE = await TransportBLE.create();
const ethAppBLE = new AppEth(transportBLE);
 
// Example of connecting to a device via USB
const transportUSB = await TransportUSB.create();
const ethAppUSB = new AppEth(transportUSB);