Add reinforcement learning example

[windmaple]

Ported the RL example to Flutter

[PaulTR]

For the model link, instead of pulling from the other TFLite example repo, let's use

https://storage.googleapis.com/download.tensorflow.org/models/tflite/flutter-plugin/reinforcement_learning/planestrike_tf.tflite

and

https://storage.googleapis.com/download.tensorflow.org/models/tflite/flutter-plugin/reinforcement_learning/planestrike_tf.tflite

[PaulTR]

Looks good on Android. Will test iOS either this weekend or mid-next week (I forgot my iPad at the office and only have one iOS device :P)

[PaulTR]

So I'm getting a message in iOS about wanting permission to see connected devices on the network. Since this is on-device ML, that shouldn't be necessary. Can you remove whatever is causing that?

[windmaple]

What's the exact msg? I don't have an iOS device and I didn't see such a msg in the iOS emulator?

[PaulTR]

Weird, can't replicate it. Sounds like a later problem if it comes up again :P