Configure mypy to old behavior

based on https://mypy-lang.blogspot.com/2022/11/mypy-0990-released.html release

pyproject.toml

@@ -30,6 +30,8 @@ asyncio_mode = "auto"
 
 [tool.mypy]
 ignore_missing_imports = true
+namespace_packages = false
+implicit_optional = true
 warn_unused_ignores = true
 exclude = [
     '^build_helpers\.py$'