add setTimeout and getTimeout method to IsoDep

[MasayukiSuda]

• Added two methods to the IsoDep class.

  • One is setTimeout and the second is getTimeout.
  • It uses Android's IsoDep setTimeout and getTimeout respectively.

• Changed the existing member variable timeout to initialTimeout.

Confirmation

NfcManager.instance.startSession(onDiscovered: (NfcTag tag) async {
      result.value = tag.data;
      var isoDep = IsoDep.from(tag);
      if (isoDep != null) {
        print("initialTimeout ${isoDep.initialTimeout}");
        var time = await isoDep.setTimeout(time: 60000000);
        print("setTimeout setTimeout $time}");
        var getTime = await isoDep.getTimeout();
        print("getTime $getTime}");
      }
      NfcManager.instance.stopSession();
    });

[MasayukiSuda]

@okadan Please review 🙇

[MasayukiSuda]

@okadan I'm in a hurry so can you review it if you like 🙇🙇🙇

[PeteClubSeven]

This would've helped me a lot too, hopefully the new API in v4.0.0 will mean this isn't required anymore.