OIDC: attempt dynamic client registration (#11074)

* add delegatedauthentication to validated server config

* dynamic client registration functions

* test OP registration functions

* add stubbed nativeOidc flow setup in Login

* cover more error cases in Login

* tidy

* test dynamic client registration in Login

* comment oidc_static_clients

* register oidc inside Login.getFlows

* strict fixes

* remove unused code

* and imports

* comments

* comments 2

* util functions to get static client id

* check static client ids in login flow

* remove dead code

* OidcRegistrationClientMetadata type

* use registerClient from js-sdk

* use OidcError from js-sdk

src/components/structures/auth/Login.tsx

@@ -50,7 +50,6 @@ _td("Invalid identity server discovery response");
 _td("Invalid base_url for m.identity_server");
 _td("Identity server URL does not appear to be a valid identity server");
 _td("General failure");
-
 interface IProps {
     serverConfig: ValidatedServerConfig;
     // If true, the component will consider itself busy.