Allow disabling auto discovery endpoint feature (wellKnownEndpointUrl)

[malciin]

Is your feature request related to a problem? Please describe.
In our app we need to handle oidc downtimes by simply redirection to login page which letting us the reverse proxy to display proper oidc down message. Thus at least core url paths (like login path) should be constructible without querying wellknown endpoint.

Currently however we cannot properly redirect to oidc without querying .wellKnownEndpoint which will fail for down oidc.

Describe the solution you'd like
Introduction of additional parameter in OpenIdConfiguration like disableEndpointDiscovery: boolean

Describe alternatives you've considered
Tried to provide full set of authWellknownEndpoints, but wellKnownEndpointUrl is still queried.

Additional context
Empty

[malciin]

Nevermind, I mixed up the libraries :)