Create room threads list view (#6904)

Implement https://github.com/vector-im/element-web/issues/18957 following requirements:
* Create a new right panel view to list all the threads in a given room.
* Change ThreadView previous phase to be ThreadPanel rather than RoomSummary
* Implement local filters for My and All threads

In addition: 
* Create a new TileShape for proper rendering requirements (hiding typing indicator)
* Create new timelineRenderingType for proper rendering requirements

src/dispatcher/dispatch-actions/threads.ts

@@ -0,0 +1,38 @@
+/*
+Copyright 2021 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.
+*/
+import { MatrixEvent } from "matrix-js-sdk/src/models/event";
+import { RightPanelPhases } from "../../stores/RightPanelStorePhases";
+import { Action } from "../actions";
+import dis from '../dispatcher';
+import { SetRightPanelPhasePayload } from "../payloads/SetRightPanelPhasePayload";
+
+export const dispatchShowThreadEvent = (event: MatrixEvent) => {
+    dis.dispatch({
+        action: Action.SetRightPanelPhase,
+        phase: RightPanelPhases.ThreadView,
+        refireParams: {
+            event,
+        },
+    });
+};
+
+export const dispatchShowThreadsPanelEvent = () => {
+    dis.dispatch<SetRightPanelPhasePayload>({
+        action: Action.SetRightPanelPhase,
+        phase: RightPanelPhases.ThreadPanel,
+    });
+};
+