add data scientist use case (directly using uploaded files) (#355)

.changeset/poor-knives-smoke.md

.changeset/wet-tips-judge.md

helpers/tools.ts

questions/simple.ts

templates/components/engines/python/agent/tools/artifact.py

...ates/components/engines/python/agent/tools/interpreter.py

...mponents/engines/typescript/agent/tools/code-generator.ts

.../components/engines/typescript/agent/tools/interpreter.ts

...ates/components/llamaindex/typescript/documents/helper.ts

...es/components/llamaindex/typescript/documents/pipeline.ts

...ates/components/llamaindex/typescript/documents/upload.ts

...components/llamaindex/typescript/streaming/annotations.ts

templates/components/routers/python/sandbox.py

templates/components/services/python/file.py

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

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

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

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

...s/types/streaming/fastapi/app/engine/utils/file_helper.py

...lates/types/streaming/nextjs/app/api/chat/upload/route.ts