feat: `Sidebar` new components (#32821)

.changeset/many-balloons-scream.md

apps/meteor/client/sidebarv2/Item/Condensed.tsx

apps/meteor/client/sidebarv2/Item/Extended.stories.tsx

apps/meteor/client/sidebarv2/Item/Extended.tsx

apps/meteor/client/sidebarv2/Item/Medium.tsx

apps/meteor/client/sidebarv2/RoomList/RoomList.tsx

apps/meteor/client/sidebarv2/RoomList/RoomListRow.tsx

apps/meteor/client/sidebarv2/RoomList/RoomListRowWrapper.tsx

...client/sidebarv2/RoomList/SidebarItemTemplateWithData.tsx

...eor/client/sidebarv2/RoomList/useSidebarListNavigation.ts

apps/meteor/client/sidebarv2/Sidebar.tsx

apps/meteor/client/sidebarv2/header/SearchList.tsx

apps/meteor/client/sidebarv2/header/SearchSection.tsx

apps/meteor/client/sidebarv2/header/actions/CreateRoom.tsx

apps/meteor/client/sidebarv2/header/actions/Search.tsx

apps/meteor/client/sidebarv2/header/actions/Sort.tsx

apps/meteor/client/sidebarv2/hooks/useAvatarTemplate.tsx

apps/meteor/client/sidebarv2/search/Row.tsx

apps/meteor/client/sidebarv2/search/SearchList.tsx

apps/meteor/client/sidebarv2/search/UserItem.tsx