frontend: Add Single Sign-on to Toolkit

[malexw]

Updates the login page from alexw/coral-login to dynamically add and hide the username / password form and a couple of single sign-on buttons depending on the backend's enabled auth strategies.

AI Description

This PR introduces changes to the authentication system, including the addition of new authentication strategies and updates to the existing ones.

• The JWT_SECRET_KEY has been renamed to AUTH_SECRET_KEY in the .env-template file and the auth.guide.md documentation.
• The auth.guide.md file has been updated to reflect the changes in the authentication process.
• The ENABLED_AUTH_STRATEGIES list in auth.py now includes BasicAuthentication, GoogleOAuth, and OpenIDConnect.
• The src/backend/main.py file has been updated to import the asyncio and os modules, and the get_strategy_endpoints function has been added to the list of imports from auth.py.
• The src/backend/main.py file now includes the SessionMiddleware middleware, which is required for temporary OAuth state storage in the session.
• The src/backend/routers/auth.py file has been updated to include the get_client_id and get_authorization_endpoint methods, and the login function has been modified to use the new authentication strategies.
• The src/backend/services/auth/jwt.py file now uses the AUTH_SECRET_KEY environment variable instead of JWT_SECRET_KEY.
• The src/backend/services/auth/strategies/base.py file has been updated to include the get_client_id, get_authorization_endpoint, and get_endpoints methods, and the authorize method has been added to the BaseOAuthStrategy class.
• The src/backend/services/auth/strategies/google_oauth.py and src/backend/services/auth/strategies/oidc.py files have been modified to include the get_client_id, get_authorization_endpoint, and get_endpoints methods, and the authorize method has been added to the GoogleOAuth and OpenIDConnect classes.
• The src/interfaces/coral_web/src/components/Welcome/OidcSSOButton.tsx file has been added to provide a button for OIDC sign-up and login.
• The src/interfaces/coral_web/src/hooks/authConfig.ts file has been updated to include the useServerAuthStrategies hook and return the list of authentication strategies.
• The src/interfaces/coral_web/src/hooks/githubAuthRoute.ts file has been removed.
• The src/interfaces/coral_web/src/hooks/oidcAuthRoute.ts file has been updated to use the useAuthConfig hook and include the handleOidcAuth function.
• The src/interfaces/coral_web/src/hooks/session.ts file now includes the googleSSOMutation and oidcSSOMutation mutations for handling Google and OIDC SSO, respectively.
• The src/interfaces/coral_web/src/pages/auth/[strategy].tsx and src/interfaces/coral_web/src/pages/auth/complete.tsx files have been added to handle the callback from OAuth providers and forward the request to the backend.
• The src/interfaces/coral_web/src/pages/login.tsx file has been updated to include the useOidcAuthRoute hook and the useMemo and useAuthConfig functions. The useGoogleAuthRoute hook has been removed, and the OidcSSOButton component has been added for OIDC sign-up and login.

[tianjing-li]

Changes look good to me!

[BeatrixCohere]

Can you give more details here