feat: Add method to retrieve current 2FA login provider

[TarasKovalenko]

Add method to retrieve current 2FA login provider

Description

Adds a new method GetTwoFactorAuthenticationLoginProviderAsync to retrieve the authentication provider being used for the current two-factor authentication (2FA) login attempt.

Changes:
Implemented new async method to fetch the current 2FA login provider

Why:

• Enables authentication flows to determine which 2FA method is currently in use
• Allows UI/UX to be customized based on the active 2FA provider
• Helps with logging and debugging of 2FA-related issues
• Useful for scenarios where different handling is needed based on the provider type

[gfoidl]

Thanks for your contribution!

But adding new method to a public API has to follow the API review process, so please file an issue first, so that the addition can be discussed.

[TarasKovalenko]

Thanks for your contribution!

But adding new method to a public API has to follow the API review process, so please file an issue first, so that the addition can be discussed.

Created, thanks!