feat: Add check for account existence before login and display error message if not found

[thahulive]

This feature introduces an option that allows the system to verify the existence of a user account before proceeding with the login process. The primary goal is to enhance security and user experience by ensuring that only existing accounts can attempt to log in.

Key Changes:

• New Configuration Option: check_account_exists_before_login

  • This option can be enabled or disabled to control whether the system verifies account availability during the login process.

• Error Handling:

  • If the account is not found, a message saying "Couldn’t find your account" will be displayed to the user.

Benefits:

• Enhanced Security: Prevents login attempts with non-existent accounts.
• Improved User Feedback: Provides clear feedback when an account is not found.

This feature provides flexibility for applications that require pre-login account validation and improves the overall user experience during authentication.

Note: Inspired by the account verification flow in Google login. 😉

[bobbyiliev]

Thanks! I think that this looks good! Tagging @tnylea for a second review

[tnylea]

Thanks @thahulive for this PR. Looks excellent, thanks for the contribution.

And thanks @bobbyiliev for pinging me 😉

I've gone ahead and changed this to merge into a branch on the main repo this way we can confirm that the tests pass. Here is the new PR: #137

Thanks again!