Add an accuracy tool that can be used to evaluate model accuracy on device.

- Adds an accuracy tool that can be used to develop evaluation pipelines to
evaluate model accuracies.
- The binary can be compiled for mobile platforms and
the tool can be used to evaluate accuracy of models by running the binary on
device.
- Adds an example implementation for imagenet ILSVRC classification task
  accuracy evaluation.
- More documentations and details coming soon.

PiperOrigin-RevId: 209869774