Implement Wi-Fi QR code scanner flow.
1. Implements WifiNetworkConfig Wi-Fi connection method
2. Shows error message when the QR code is not valid and hides it after 2s
3. In configurator mode, launchs AddDeviceFragment for a valid QR code
4. In enrollee mode, connects Wi-Fi for a valid QR code
Bug:
118794978
Test: manual test
atest WifiQrCodetest
atest WifiDppConfiguratorActivityTest
atest WifiDppEnrolleeActivityTest
atest WifiDppQrCodeScannerFragmentTest
Change-Id: Ie4731b22df295c60906156d33ea28dad9c084ce4