Notebook tutorial for Tree of Thoughts

[rahulbshrestha]

This PR is a draft for the blog post on implementation of Tree of Thoughts. This PR works on this issue.

Next steps:

• [x] Add search algorithm
• [x] Clean up functions
• [x] Add proper explanations for each step
• [ ] Convert to readme.md file

[review-notebook-app[bot]]

Check out this pull request on 

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