* 🗃️ add new tables for multiple brains
* 🗑️ remove date input from fetch_user_id_from_credentials
* ✨ new /brain endpoints
* ♻️ refactor backend utils by splitting it into files
* 💡 comments for next actions to update /upload
* feat: user can create api keys
* fix: linting on build
* Update backend/routes/api_key_routes.py
* chore: rename and refactor AuthBearer
* chore: add types