refreshed ui, added support for response streaming, and added new database.

again trying to get sources to work

trying to see how to print sources

source names

adding api key support in db.py

was usign deprecated method for initializing cilent

hopefully it works on the space

new db.py class to integrate huggingface datasets, chromadb, and vector search

created a new class to interface with chromadb, huggingface dataset repo to persist database

added utilities folder