Use ML kit for qrcode scanning

[wongsyrone]

Pros:

• Google official support library

Cons:

• Increase APK size
• This is a beta release of ML Kit. This API might be changed in backward-incompatible ways and is not subject to any SLA or deprecation policy.

ref: https://developers.google.com/ml-kit/vision/barcode-scanning ref impl: https://github.com/shadowsocks/shadowsocks-android/pull/2551

[TchaikovDriver]

Interesting, I would have a try.

[TchaikovDriver]

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