[feature] Use ML kit API

[lookfirst]

play-services-vision is deprecated in favor of the ML Kit api.

https://developers.google.com/vision/android/barcodes-overview

"The Mobile Vision API is now a part of ML Kit. We strongly encourage you to try it out, as it comes with new capabilities like on-device image labeling! Also, note that we ultimately plan to wind down the Mobile Vision API, with all new on-device ML capabilities released via ML Kit."

Docs are here:

https://firebase.google.com/docs/ml-kit/android/read-barcodes

[AmolGangadhare]

@lookfirst Thanks for using the plugin. Yes, the vision API is part of ml kit now and maybe deprecated. Currently, im evaluating ml kit in plugin which would be the major changes to existing code. Definitely plugin will be moving to use ml kit soon.

[lookfirst]

Great. Thank you. I'll likely switch over to your code from the other plugin, as soon as I have a chance. Having it be on the latest API's would be appreciated. Thanks for all your hard work.

[lookfirst]

fyi, switched to your code today. it is excellent, thanks.

[lookfirst]

Possibly helpful: https://github.com/FirebaseExtended/flutterfire/tree/master/packages/firebase_ml_vision

but please don't switch to it for ios. ;-)

[pynner]

+1 for this feature!