Class order in W&B Confusion matrix

[AndreaCossu]

W&B confusion matrix should let the user specify a custom class order used when visualizing the confusion matrix. It is sufficient to set a boolean parameter similar to the one present in the StreamConfusionMatrix: when True, classes are showed in the order in which they appear during training, when False ordered by their absolute value.

[Mathieu4141]

The issue I had is that W&B sort the classes alphabetically on display, and it doesn't seem to be a way to turn that off

[AndreaCossu]

@digantamisra98 can you work on this?

[digantamisra98]

Sure, yes