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

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

cc @sekyondaMeta @svekars @kit1980 @brycebortree