Hosted Backend APIs to Incorporate login_hint and idp_hint

[jobannon]

Problem

Our hosted pages will complete a call to the oauth2/authorize endpoint. Our current implementation does not allow you to pass hinting parameters from /app/login which would ultimately be caught by the hosted pages (oauth2/authorize).

Solution

Ensure that the app/login endpoint can accept the login_hint and idp_hint parameters.

Additional context

Customer observation on ticket - 74589

https://fusionauth.io/docs/lifecycle/authenticate-users/identity-providers/#hints

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