Implement multimodal( FTS, vector, hybrid) search capability

[subin-chella]

• Add new multiModalSearch function in lanceTableWrapper
• Support vector, text, and hybrid search modes
• Integrate with MainSidebar component for user interface
• Update DBResultPreview and DBSearchPreview to handle new result format
• Improve search result display with conditional rendering fixes #86

Test: https://github.com/user-attachments/assets/ca162f51-e005-4840-a3be-3ce72a7438f2

[joseplayero]

thanking you for attempting this @subin-chella

imo this should be solved with a full text search index not sql expression like you have implemented in pr.

@milaiwi has been working on this exact implementation so would be good to hear thoughts