Add support for graph memory using Kuzu

[sdht0]

Description

Hi! This PR adds Kuzu as an option for the graph memory backend.

Kuzu is an embeddable in-process graph database, which means there is no server to setup. Kuzu just needs a path to a directory for data persistence, but can also run completely in memory, as is the default in this PR.

Opening this PR now for early feedback while I work on the documentation and testing.

Type of change

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

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] Test Script (Jupyter notebook)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] 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
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings

Maintainer Checklist

• [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
• [ ] Made sure Checks passed

[CLAassistant]

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