py.typed marker is missing

[kshitij-enable]

Environment details

• OS type and version: macOS Ventura 13.3
• Python version: 3.11
• pip version: 23.1.2
• google-auth-oauthlib version: 1.0.0

Steps to reproduce

1. import google_auth_oauthlib.flow in python code
2. run mypy type checker

Stack trace

Skipping analyzing "google_auth_oauthlib": module is installed, but missing library stubs or py.typed marker

[tamird]

Apart from py.typed this library is not using type hints. Would be nice to have them.