feat:heroku llm integration

[michaelmalave]

Description

The intention of these changes is to introduce Heroku integration and its usage within LLamaindex.

Fixes # (issue)

New Package?

Did I fill in the tool.llamahub section in the pyproject.toml and provide a detailed README.md for my new integration or package?

• Yes
• No

Version Bump?

Did I bump the version in the pyproject.toml file of the package I am updating? (Except for the llama-index-core package)

• Yes
• No

Type of Change

Please delete options that are not relevant.

• 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)
• This change requires a documentation update

How Has This Been Tested?

Your pull-request will likely not be merged unless it is covered by some form of impactful unit testing.

• I added new unit tests to cover this change
• I believe this change is already covered by existing unit tests

Suggested 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I ran uv run make format; uv run make lint to appease the lint gods

[tlowrimore-heroku]

Hi there! Curious to know if there are any other actions we need to take to get this PR reviewed. Thanks!

[logan-markewich]

Seems fine, just a few small comments

[logan-markewich]

we can delete this

[tlowrimore-heroku]

Hi @logan-markewich! 👋 It's not clear to me what you're referring to in this comment. Do you mean delete the entire file?

[logan-markewich]

Yea, its not needed (we have the readme). If you really want an example we can throw a notebook into docs/docs/examples/llm