Similarity search over mumblings

[kikuomax]

To demonstrate the FlechasDB system, I want to add a feature to do similarity search over mumblings.

• How and when do we process mumblings and build the vector database? #27
• How do we request similarity search? API? What does the API look like? #28
• Demonstrate the similarity search feature on the viewer
  • How do we represent search results? #29
  • How and when do we calculate embeddings of query texts? #30

[kikuomax]

I think we should chunk each mumbling into sentences and calculate embeddings for individual sentences.