added kg-rag dataset

[tjaffri]

Description

Added the docugami kg-rag dataset for SEC-10Q. You can read more here about the motivation for creating this dataset and how it was created: https://github.com/docugami/KG-RAG-datasets

The corresponding llama-datasets PR is: https://github.com/run-llama/llama-datasets/pull/43

Type of Change

Please delete options that are not relevant.

• [x] New Dataset
• [ ] Bug fix / Smaller change
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Suggested Checklist:

• [ ] I have added a library.json file if a new loader/tool was added
• [x] I have performed a self-review of my own code
• [x] 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 make format; make lint to appease the lint gods

[tjaffri]

Hi @nerdai made the change requested... thank you!

[nerdai]

Thanks @tjaffri -- merging this now! :)