Grant Element Call widget caps for "raise hand"

This allows the widget to send and receive event types used by the
"raise hand" feature (element-hq/element-call#2542) without prompting
the user to grant the capabilities to do so.

* Test that call widgets get RoomCreate events

src/stores/widgets/StopGapWidgetDriver.ts

@@ -175,7 +175,11 @@ export class StopGapWidgetDriver extends WidgetDriver {
                 WidgetEventCapability.forStateEvent(EventDirection.Receive, EventType.RoomCreate).raw,
             );
 
-            const sendRecvRoomEvents = ["io.element.call.encryption_keys"];
+            const sendRecvRoomEvents = [
+                "io.element.call.encryption_keys",
+                EventType.Reaction,
+                EventType.RoomRedaction,
+            ];
             for (const eventType of sendRecvRoomEvents) {
                 this.allowedCapabilities.add(WidgetEventCapability.forRoomEvent(EventDirection.Send, eventType).raw);
                 this.allowedCapabilities.add(WidgetEventCapability.forRoomEvent(EventDirection.Receive, eventType).raw);

test/stores/widgets/StopGapWidgetDriver-test.ts

@@ -94,6 +94,10 @@ describe("StopGapWidgetDriver", () => {
             "org.matrix.msc2762.timeline:!1:example.org",
             "org.matrix.msc2762.send.event:org.matrix.rageshake_request",
             "org.matrix.msc2762.receive.event:org.matrix.rageshake_request",
+            "org.matrix.msc2762.send.event:m.reaction",
+            "org.matrix.msc2762.receive.event:m.reaction",
+            "org.matrix.msc2762.send.event:m.room.redaction",
+            "org.matrix.msc2762.receive.event:m.room.redaction",
             "org.matrix.msc2762.receive.state_event:m.room.create",
             "org.matrix.msc2762.receive.state_event:m.room.member",
             "org.matrix.msc2762.receive.state_event:org.matrix.msc3401.call",