Add hints(idp_hint and login_hint) to startLogin Flow.

[chfields]

Add hints to startLogin Flow.

Problem

I would like to use the Hints feature described here: https://fusionauth.io/docs/lifecycle/authenticate-users/identity-providers/#hints. The idp_hint and login_hint allow you to direct a user to a specific IDP when you have the id or domain. There are currently no parameters that allow you to specify either hint.

Alternatives/workarounds

The workaround is not to use startLogin and to directly build the URL yourself. This diminishes a lot of the value that the react-sdk provides.

Additional context

The domain feature on IDPs works ok for SAML and OIDC providers; however, the idp_hint feature will cover all providers and give better control of the user flow. Thanks for considering.

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