Describe the bug
The behavior for handling prompt=none described in the OIDC spec (https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest) is:

• If prompt=none, return error it user isn't authenticated
• If prompt=none + something else then return an error.

The current implementation raises an OIDCNoPrompt exception whenever we get prompt=none, the code to properly handle the exists in https://github.com/oauthlib/oauthlib/blob/master/oauthlib/openid/connect/core/grant_types/base.py#L302

Expected behavior

The functions validate_silent_login and validate_silent_authorization must be called and the proper errors must be raised