Add support for Federated Logout for Azure and other IdPs

[robotdan]

Add support for Federated Logout for Azure and other IdPs

Problem

When logging out of FusionAuth SSO, we do not have the option to allow you to also log out of a federated IdP that may have been used to begin the login process with FusionAuth.

Solution

Support some capability to perform federated logout. Support for this is on an IdP by IdP basis, and will not always work. But some IdPs do have documented methods to request a logout by a service provider.

Alternatives/workarounds

N/A

Additional context

• Similar feature request to what is partially available in Auth0 https://auth0.com/docs/login/logout/log-users-out-of-idps

Community guidelines

All issues filed in this repository must abide by the FusionAuth community guidelines.

How to vote

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[andrewpai]

Need to investigate where and how we would want to enable this.