Add mypy checker for importing and update CI condition (#387)

.changeset/two-masks-design.md

helpers/providers/anthropic.ts

helpers/providers/azure.ts

helpers/providers/gemini.ts

helpers/providers/groq.ts

helpers/providers/llmhub.ts

helpers/providers/mistral.ts

helpers/providers/ollama.ts

helpers/providers/openai.ts

helpers/tools.ts

questions/index.ts

...mponents/engines/python/agent/tools/document_generator.py

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

...s/components/engines/python/agent/tools/openapi_action.py

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

templates/components/routers/python/sandbox.py

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

...lates/types/streaming/fastapi/app/api/routers/__init__.py

...es/types/streaming/fastapi/app/api/routers/chat_config.py

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