feat: Add huggingface custom callback example

[parambharat]

This PR adds an example to showcase how to instrument HF Trainer with a custom Wandb Progress Callback that displays predictions and labels in a Weights & Biases Table as the Training progresses.

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Before marking the PR as ready for review, please run your notebook one more time. Restart the Colab and run all. We will provide you with links to open the Colabs below

The following colabs were changed -colabs/huggingface/Custom_Progress_Callback.ipynb