Support m.jitsi-typed widgets as Jitsi widgets

Fixes https://github.com/vector-im/riot-web/issues/9268

src/widgets/WidgetType.ts

@@ -0,0 +1,26 @@
+/*
+Copyright 2020 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.
+*/
+
+export class WidgetType {
+    public static readonly JITSI = new WidgetType("m.jitsi", "jitsi");
+
+    constructor(public readonly preferred: string, public readonly legacy: string) {
+    }
+
+    public matches(type: string): boolean {
+        return type === this.preferred || type === this.legacy;
+    }
+}