feat: add weather widget and weather tool (#72)

.changeset/poor-eels-beam.md

helpers/python.ts

helpers/tools.ts

helpers/typescript.ts

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

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

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

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

templates/components/engines/typescript/agent/tools/index.ts

...ates/components/engines/typescript/agent/tools/weather.ts

templates/types/streaming/express/package.json

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

.../types/streaming/express/src/controllers/stream-helper.ts

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

...ates/types/streaming/fastapi/app/api/routers/messaging.py

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

...ates/types/streaming/nextjs/app/api/chat/stream-helper.ts

...es/types/streaming/nextjs/app/components/chat-section.tsx

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

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