fix: final class for tflite bindings

[mdejeans]

Fix #234
Upgraded ffigen, melos, flutter lint + add some help in read me using melos.

  ffigen: ^10.0.0
  flutter_lints: ^4.0.0
  melos: ^6.1.0

We can probably bump ffigen further thanks to #244

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[PaulTR]

So that's actually a generated class :) When we run the ffi script (https://github.com/tensorflow/flutter-tflite/blob/main/ffigen_tensorflow_lite.yaml) this gets overridden.

[s12dar]

@PaulTR, I wonder if there is an estimated timeline for when the tflite_flutter package will be updated to address the recent issues with the Dart upgrade?

[craiglabenz]

This should be a matter updating all the dependencies everywhere. What's happening is that ffigen is generating newer code than other aspects of the pubspec.yaml file are cool with.

[chathurach]

We can update the ffigen package to 8.0.0 and resolve this issue. This issue has been resolved after 8.0.0 version. https://pub.dev/packages/ffigen/changelog

[mdejeans]

@PaulTR @chathurach gotcha!

[craiglabenz]

LGTM