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/utils/oidc/error.ts

@@ -1,24 +0,0 @@
-/*
-Copyright 2023 The Matrix.org Foundation C.I.C.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-/**
- * OIDC error strings, intended for logging
- */
-export enum OidcClientError {
-    DynamicRegistrationNotSupported = "Dynamic registration not supported",
-    DynamicRegistrationFailed = "Dynamic registration failed",
-    DynamicRegistrationInvalid = "Dynamic registration invalid response",
-}