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/components/structures/ThreadView.tsx

@@ -156,7 +156,7 @@ export default class ThreadView extends React.Component<IProps, IState> {
                 <BaseCard
                     className="mx_ThreadView"
                     onClose={this.props.onClose}
-                    previousPhase={RightPanelPhases.RoomSummary}
+                    previousPhase={RightPanelPhases.ThreadPanel}
                     withoutScrollContainer={true}
                 >
                     { this.state.thread && (