Dynamically select model for Groq (#278)

.changeset/real-zebras-attack.md

helpers/providers/groq.ts

templates/components/settings/python/settings.py

templates/types/streaming/express/package.json

...ypes/streaming/express/src/controllers/engine/settings.ts

...es/types/streaming/nextjs/app/api/chat/engine/settings.ts

templates/types/streaming/nextjs/package.json