feat: add Weaviate vector database support for Python (#223)

.changeset/great-games-behave.md

helpers/env-variables.ts

helpers/python.ts

helpers/types.ts

questions.ts

templates/components/engines/typescript/agent/chat.ts

templates/components/engines/typescript/chat/chat.ts

...es/components/vectordbs/python/llamacloud/query_filter.py

...ates/components/vectordbs/python/weaviate/query_filter.py

templates/components/vectordbs/python/weaviate/vectordb.py

...components/vectordbs/typescript/llamacloud/queryFilter.ts

...s/streaming/express/src/controllers/engine/queryFilter.ts

templates/types/streaming/fastapi/app/api/routers/chat.py

...es/types/streaming/fastapi/app/api/routers/chat_config.py

...ypes/streaming/fastapi/app/api/routers/vercel_response.py

templates/types/streaming/fastapi/app/engine/query_filter.py

...types/streaming/nextjs/app/api/chat/engine/queryFilter.ts