Is your feature request related to a problem?
When using Pinniped as Identity Provider for my Web Application, i can't perform a logout, since ther is no logout Endpoint (unless i haven't found it yet)
Describe the solution you'd like
I would like a end_session_endpoint also declared in the .well-known/openid-configuration like it is standard in OIDC Logins.
Describe alternatives you've considered
Alternative, an other method to perform a correct logout, that i can implement in my application.
Additional context
Thanks for your work!
Kind Regards