feat(nfc): add new functions (#853)
feat(nfc): add new functions (#853)

Added:
- bytesToHexString
- stringToBytes
- bytesToString

Fixed:
- addTagDiscoveredListener
klirix/ionic-native,klirix/ionic-native,xueron/ionic-native,driftyco/ionic-native,xueron/ionic-native,klirix/ionic-native,xueron/ionic-native,driftyco/ionic-native,driftyco/ionic-native,xueron/ionic-native