Implement rag prototpye

[kevin-on]

No description provided.

[kevin-on]

TODO Before Merging

• Style Improvements
  • Update MarkdownReferenceBlock styles (MarkdownReferenceBlock.tsx)
  • Update QueryProgress component style (QueryProgress.tsx)
  • Update MentionableBadge styles (MentionableBadge.tsx)
  • Add folder and vault icons to MentionTypeaheadOption (MentionPlugin.tsx)
• Decide vault index update strategy (ragEngine.ts)
• Add Drizzle ORM for handling DB migration
• Check ESbuild config
• FIX MEMORY LEAK
• Show update progress when re-indexing by command
• Truncate long chat history in PromptGenerator

Backlog

• Implement scoring logic for folders and vault in fuzzy search (fuzzy-search.ts)
• Add similarity boosting for mentioned files/folders in RAG query processing (promptGenerator.ts)
• Implement automatic vault re-indexing on settings change (ragEngine.ts)
• Migrate to WebAssembly-based tiktoken for better performance and token-based chunking (token.ts, vector-db/manager.ts)
• Create HNSW index for faster vector database search (vector-db/repository.ts)

[glowingjade]

Can you write a brief CONTRIBUTING.md file that includes instructions on how to use Drizzle, specifically regarding migration generation?
Please use this as a reference:
https://github.com/facebook/lexical/blob/main/CONTRIBUTING.md