Integrate searching public rooms and people into the new search experience (#8707)

* Implement searching for public rooms and users in new search experience
* Implement loading indicator for spotlight results
* Moved spotlight dialog into own subfolder
* Extract search result avatar into separate component
* Build generic new dropdown menu component
* Build new network menu based on new network dropdown component
* Switch roomdirectory to use new network dropdown
* Replace old networkdropdown with new networkdropdown
* Added component for public room result details
* Extract hooks and subcomponents from SpotlightDialog
* Create new hook to get profile info based for an mxid
* Add hook to automatically re-request search results
* Add hook to prevent out-of-order search results
* Extract member sort algorithm from InviteDialog
* Keep sorting for non-room results stable
* Sort people suggestions using sort algorithm from InviteDialog
* Add copy/copied tooltip for invite link option in spotlight
* Clamp length of topic for public room results
* Add unit test for useDebouncedSearch
* Add unit test for useProfileInfo
* Create cypress test cases for spotlight dialog
* Add test for useLatestResult to prevent out-of-order results

src/components/views/dialogs/spotlight/Option.tsx

@@ -0,0 +1,43 @@
+/*
+Copyright 2022 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 classNames from "classnames";
+import React, { ComponentProps, ReactNode } from "react";
+
+import { RovingAccessibleButton } from "../../../../accessibility/roving/RovingAccessibleButton";
+import { useRovingTabIndex } from "../../../../accessibility/RovingTabIndex";
+import AccessibleButton from "../../elements/AccessibleButton";
+
+interface OptionProps extends ComponentProps<typeof RovingAccessibleButton> {
+    endAdornment?: ReactNode;
+}
+
+export const Option: React.FC<OptionProps> = ({ inputRef, children, endAdornment, className, ...props }) => {
+    const [onFocus, isActive, ref] = useRovingTabIndex(inputRef);
+    return <AccessibleButton
+        {...props}
+        className={classNames(className, "mx_SpotlightDialog_option")}
+        onFocus={onFocus}
+        inputRef={ref}
+        tabIndex={-1}
+        aria-selected={isActive}
+        role="option"
+    >
+        { children }
+        <div className="mx_SpotlightDialog_enterPrompt" aria-hidden>↵</div>
+        { endAdornment }
+    </AccessibleButton>;
+};