bump create-llama to 0.11 and update event handler (#260)

.changeset/slow-papayas-camp.md

.changeset/sour-donkeys-develop.md

helpers/python.ts

templates/components/engines/python/agent/engine.py

templates/components/engines/python/chat/engine.py

templates/components/vectordbs/python/llamacloud/index.py

templates/components/vectordbs/python/none/index.py

templates/types/extractor/fastapi/app/engine/index.py

templates/types/extractor/fastapi/app/services/extractor.py

templates/types/extractor/fastapi/pyproject.toml

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

templates/types/streaming/fastapi/app/api/services/file.py

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

templates/types/streaming/fastapi/pyproject.toml