[➕ Feature]: Provide a Google AUTH_TYPE

[bugfix4u]

Is your feature request related to a problem? Please describe.
Add an AUTH_TYPE for Google authentication.

Describe the solution you'd like
Proposed example config:

AUTH_TYPE=GOOGLE
AUTH_GOOGLE_ALLOW_SIGN_UP=false
AUTH_GOOGLE_CLIENT_ID=MY_AUTH_GOOGLE_CLIENT_ID
AUTH_GOOGLE_CLIENT_SECRET=MY_AUTH_GOOGLE_CLIENT_SECRET
AUTH_GOOGLE_SCOPES=https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email
AUTH_GOOGLE_AUTH_URL=https://accounts.google.com/o/oauth2/auth
AUTH_GOOGLE_TOKEN_URL=https://accounts.google.com/o/oauth2/token
AUTH_GOOGLE_API_URL=https://www.googleapis.com/oauth2/v1/userinfo
AUTH_GOOGLE_ALLOWED_DOMAINS=mycompany.com