feat: implement interpreter tool (#94)

.changeset/gentle-knives-unite.md

.github/workflows/e2e.yml

helpers/env-variables.ts

helpers/index.ts

helpers/tools.ts

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

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

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

templates/types/streaming/express/gitignore

templates/types/streaming/express/index.ts

templates/types/streaming/express/package.json

templates/types/streaming/fastapi/gitignore

templates/types/streaming/fastapi/main.py

...s/types/streaming/nextjs/app/api/files/[...slug]/route.ts

...s/streaming/nextjs/app/components/ui/chat/chat-events.tsx

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

...lates/types/streaming/nextjs/app/components/ui/lib/url.ts

templates/types/streaming/nextjs/gitignore

templates/types/streaming/nextjs/package.json