feat: Allow OAuth authorization request with response_type=none

[nynymike]

See: https://openid.net/specs/oauth-v2-multiple-response-types-1_0.html#none

This section registers the Response Type none, in accordance with the stipulations in 
the OAuth 2.0 specification,  Section 8.4. The intended purpose is to enable use cases 
where a party requests the Authorization Server to register a grant of access to a 
Protected Resource on behalf of a Client but requires no access credentials to be returned 
to the Client at that time. The means by which the Client eventually obtains the access credentials 
is left unspecified here.

One scenario is where a user wishes to purchase an application from a market, and desires to 
authorize application installation and grant the application access to Protected Resources in a 
single step. However, since the user is not presently interacting with the (not yet active) application, 
it is not appropriate to return access credentials simultaneously in the authorization step.

Also need to update OpenID Configuration Parameter: response_types_supported

Note: downport to oxAuth