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

test/components/structures/__snapshots__/ThreadPanel-test.tsx.snap

@@ -0,0 +1,71 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`ThreadPanel Header expect that All filter for ThreadPanelHeader properly renders Show: All threads 1`] = `
+<div
+  className="mx_ThreadPanel__header"
+>
+  <span>
+    Threads
+  </span>
+  <ContextMenuButton
+    inputRef={
+      Object {
+        "current": null,
+      }
+    }
+    isExpanded={false}
+    onClick={[Function]}
+  >
+    Show: All threads
+  </ContextMenuButton>
+</div>
+`;
+
+exports[`ThreadPanel Header expect that My filter for ThreadPanelHeader properly renders Show: My threads 1`] = `
+<div
+  className="mx_ThreadPanel__header"
+>
+  <span>
+    Threads
+  </span>
+  <ContextMenuButton
+    inputRef={
+      Object {
+        "current": null,
+      }
+    }
+    isExpanded={false}
+    onClick={[Function]}
+  >
+    Show: My threads
+  </ContextMenuButton>
+</div>
+`;
+
+exports[`ThreadPanel Header expect that ThreadPanelHeader has the correct option selected in the context menu 1`] = `
+<AccessibleButton
+  aria-selected={true}
+  className="mx_ThreadPanel_Header_FilterOptionItem"
+  element="div"
+  onClick={[Function]}
+  role="button"
+  tabIndex={0}
+>
+  <div
+    aria-selected={true}
+    className="mx_AccessibleButton mx_ThreadPanel_Header_FilterOptionItem"
+    onClick={[Function]}
+    onKeyDown={[Function]}
+    onKeyUp={[Function]}
+    role="button"
+    tabIndex={0}
+  >
+    <span>
+      All threads
+    </span>
+    <span>
+      Shows all threads from current room
+    </span>
+  </div>
+</AccessibleButton>
+`;