Add missing fields to the returned nodes from DatabricksVectorSearch

[Jasonli1997]

Description

The returned nodes from the DatabricksVectorSearch currently do not include star_char, end_char, and relationships, the last of which is required for the usage of more advanced retrieval strategies such as Auto Merging Retriever, showcased in the demo notebook. After the changes I made, the three fields above will be added to the TextNode, if the user wishes to do so by including node_info column when initializing the DatabricksVectorSearch object.

Type of Change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

I showed how the new feature works in the demo notebook.

• Added new notebook (that tests end-to-end)

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• 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

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