Support pagination for delayed event retrieval

Author: AndrewFerr

src/client.ts

@@ -5339,12 +5339,13 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
      *   Check progress on [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) for more details.
      */
     // eslint-disable-next-line
-    public async _unstable_getDelayedEvents(): Promise<DelayedEventInfo> {
+    public async _unstable_getDelayedEvents(fromToken?: string): Promise<DelayedEventInfo> {
         if (!(await this.doesServerSupportUnstableFeature(UNSTABLE_MSC4140_DELAYED_EVENTS))) {
             throw Error("Server does not support the delayed events API");
         }
 
-        return await this.http.authedRequest(Method.Get, "/delayed_events", undefined, undefined, {
+        const queryDict = fromToken ? { from: fromToken } : undefined;
+        return await this.http.authedRequest(Method.Get, "/delayed_events", queryDict, undefined, {
             prefix: `${ClientPrefix.Unstable}/${UNSTABLE_MSC4140_DELAYED_EVENTS}`,
         });
     }