feat: support for visualizing citation results (via embeddings)

[KKenny0]

Description

• Support for visualizing the similarity between query and retrieved documents

Type of change

• [x] New features (non-breaking change).
• [ ] Bug fix (non-breaking change).
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected).

Checklist

• [x] I have performed a self-review of my code.
• [ ] I have added thorough tests if it is a core feature.
• [x] There is a reference to the original bug report and related work.
• [x] I have commented on my code, particularly in hard-to-understand areas.
• [x] The feature is well documented.