llm.py port

[shreyasvinaya]

Description

adds LLM.py and a helpers.py due to large number of lines addition to one file

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • In this case, we recommend to discuss your modification on GitHub issues before creating the PR
• Documentations (modification for documents)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[rbharath]

@ARY2260 Can you do a round of review?

@shreyasvinaya The API feels like it is passing around a lot of parameters in a way that will be hard to maintain. I will think more about how to improve

[rbharath]

Why do we want this data class?

[rbharath]

@shreyasvinaya This PR needs to be split up into smaller PRs. Think about how to factor it down. Another general comment is that individual functions are very long; there is not a clean logic here. This code will become rapidly very hard to maintain