📚 Add training from a checkpoint example

[samet-akcay]

📝 Description

• Add both CLI and API examples showing how training can be resumed from a checkpoint.
• 🛠️ Fixes 📚 v1 - Docs Add the feature to resume training from a previous training #1558

✨ Changes

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• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🔨 Refactor (non-breaking change which refactors the code base)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔒 Security update

✅ Checklist

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• 📋 I have summarized my changes in the CHANGELOG and followed the guidelines for my type of change (skip for minor changes, documentation updates, and test enhancements).
• 📚 I have made the necessary updates to the documentation (if applicable).
• 🧪 I have written tests that support my changes and prove that my fix is effective or my feature works (if applicable).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.66%. Comparing base (db4c285) to head (85028a9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2389   +/-   ##
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  Coverage   81.66%   81.66%           
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  Files         283      283           
  Lines       12682    12682           
=======================================
  Hits        10357    10357           
  Misses       2325     2325           

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[ashwinvaidya17]

Thanks