NEW: recipe tutorial on implementing a keras progress bar

[loganthomas]

Fixes #2925
Re-implements #2921 (accidental deletion from forked repo)

Description

New recipe tutorial on how to implement a keras progress bar in the training/test loop

• How to implement Keras's model training progress bar in PyTorch

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

cc @sekyondaMeta @svekars @kit1980 @brycebortree

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2946

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit 3e40dd1 with merge base 0740801 ():
💚 Looks good so far! There are no failures yet. 💚

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