Add slimpajama example

[hemildesai]

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[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[ericharper]

Let's move notebooks to ./tutorials

[jgerh]

I completed the technical edit of the tutorials/llm/slimpajama/data_pipeline.ipynb and
tutorials/llm/slimpajama/pretraining.ipynb files and left comments. Please review the copyedits, make the changes to the source files, and resolve all open threads in the Reply field.

[hemildesai]

I completed the technical edit of the tutorials/llm/slimpajama/data_pipeline.ipynb and tutorials/llm/slimpajama/pretraining.ipynb files and left comments. Please review the copyedits, make the changes to the source files, and resolve all open threads in the Reply field.

I have made all the changes and resolved the threads, PTAL.

[github-actions]

beep boop 🤖: 🚨 The following files must be fixed before merge!

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Your code was analyzed with PyLint. The following annotations have been identified:

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Your code has been rated at 10.00/10

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Thank you for improving NeMo's documentation!

[github-actions]

[🤖]: Hi @hemildesai 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g