Add next questions suggestion to the user (#170)

.changeset/tall-pans-bake.md

...ates/components/llamaindex/typescript/streaming/stream.ts

.../components/llamaindex/typescript/streaming/suggestion.ts

...ypes/streaming/express/src/controllers/chat.controller.ts

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

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

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

...es/types/streaming/fastapi/app/api/services/suggestion.py

templates/types/streaming/nextjs/app/api/chat/route.ts

...mponents/ui/chat/chat-message/chat-suggestedQuestions.tsx

...ming/nextjs/app/components/ui/chat/chat-message/index.tsx

...streaming/nextjs/app/components/ui/chat/chat-messages.tsx

...es/types/streaming/nextjs/app/components/ui/chat/index.ts