Add firebase authentication in Mesop

[harishmohanraj]

Client API:

# Client API
from fastagency.ui.mesop import MesopUI, 
from fastagency.ui.mesop.firebase_auth import FirebaseAuth, FirebaseConfig

# Create config
firebase_config = FirebaseConfig(
    api_key=os.getenv("FIREBASE_API_KEY"),
    auth_domain=os.getenv("FIREBASE_AUTH_DOMAIN"),
    project_id=os.getenv("FIREBASE_PROJECT_ID"),
    storage_bucket=os.getenv("FIREBASE_STORAGE_BUCKET"),
    messaging_sender_id=os.getenv("FIREBASE_MESSAGING_SENDER_ID"),
    app_id=os.getenv("FIREBASE_APP_ID")
)

# Initialize auth with Google sign-in
auth = FirebaseAuth(
    sign_in_methods={"google"},
    config=firebase_config
)

ui = MesopUI(auth=auth)

• Figure-out client API
• Implement the Auth class
  • Implement method to return the relaxed the security policy
  • Pass the firebase config to the web component
  • Read the service account JSON key file location form GOOGLE_APPLICATION_CREDENTIALS
  • Show chat page only when the signed email is in the AUTHORIZED_USER_EMAILS list
• Integrate the Auth changes in MesopUI class
  • Add login and logout button
  • Show auth component only when the auth parameter is passed MesopUI(auth=auth)
• Mesop tests
• Documentation