Add mypy checker (#346)

.husky/pre-commit

e2e/python/resolve_dependencies.spec.ts

helpers/python.ts

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

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

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

...lates/components/engines/python/agent/tools/duckduckgo.py

templates/components/engines/python/chat/engine.py

templates/components/loaders/python/__init__.py

templates/components/loaders/python/db.py

templates/components/loaders/python/web.py

templates/components/settings/python/llmhub.py

templates/components/settings/python/settings.py

templates/components/vectordbs/python/astra/vectordb.py

templates/components/vectordbs/python/chroma/vectordb.py

templates/components/vectordbs/python/milvus/vectordb.py

templates/components/vectordbs/python/none/index.py

templates/types/extractor/fastapi/app/engine/generate.py

templates/types/extractor/fastapi/app/engine/index.py

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