Strategy for authenticating using Google

This strategy builds on-top of AshAuthentication.Strategy.Oidc and assent.

In order to use Google you need to provide the following minimum configuration:

• client_id
• redirect_uri
• client_secret

As of Assent v0.3.0, the Google strategy uses OpenID Connect (OIDC) and automatically retrieves configuration (token URL, user info URL, etc.) from Google's discovery endpoint.

More documentation:

• The Google OpenID Connect Overview.
• The Google Tutorial
• The OIDC documentation