Add timezone to user profile (#20)

* [create-pull-request] automated change (#12966)

Co-authored-by: github-merge-queue <github-merge-queue@users.noreply.github.com>

* Add timezone to right panel profile.

* Add setting to publish timezone

* Add string for timezone publish

* Automatically update timezone when setting changes.

* Refactor to using a hook

And automatically refresh the timezone every minute.

* Check for feature support for extended profiles.

* lint

* Add timezone

* Remove unintentional changes

* Use browser default timezone.

* lint

* tweaks

* Set timezone publish at the device level to prevent all devices writing to the timezone field.

* Update hook to use external client.

* Add test for user timezone.

* Update snapshot for preferences tab.

* Hide timezone info if not provided.

* Stablize test

* Fix date test types.

* prettier

* Add timezone tests

* Add test for invalid timezone.

* Update screenshot

* Remove check for profile.

---------

Co-authored-by: ElementRobot <releases@riot.im>
Co-authored-by: github-merge-queue <github-merge-queue@users.noreply.github.com>

src/components/views/settings/tabs/user/PreferencesUserSettingsTab.tsx

@@ -302,6 +302,7 @@ export default class PreferencesUserSettingsTab extends React.Component<IProps,
                         </div>
 
                         {this.renderGroup(PreferencesUserSettingsTab.TIME_SETTINGS)}
+                        <SettingsFlag name="userTimezonePublish" level={SettingLevel.DEVICE} />
                     </SettingsSubsection>
 
                     <SettingsSubsection