Add VectorDB Integration

[abhishekas7]

Description #137
This PR introduces a new feature to integrate a VectorDB into the bot configuration, enhancing the bot's ability to store and retrieve vector-based data efficiently. This integration supports improved query performance and precise matching capabilities for use cases.

Key Changes:

• Added backend support for MongoDB and ChromaDB as VectorDBs, including test credentials for both to facilitate development.
• Implemented logic to load vector data from the configured VectorDB if available; otherwise, defaults to the standard configuration.
• VectorDB Setup: Added configuration options for initializing and connecting to the VectorDB, supporting ChromaDB and MongoDB.
• ChromaDB: Connection configured via path parameter.
• MongoDB: Connection configured via uri parameter.
• Test Credentials: Users can test database credentials before finalizing the setup. Upon successful testing, users can add VectorDB (ChromaDB or MongoDB) to the bot’s configuration.

[sethumadhavan-k]

@ashmilhussain LGTM (frontend)