chore: Introduce `ui-avatar` package to monorepo (#31482)

apps/meteor/client/components/RoomAutoComplete/Avatar.tsx

...r/client/components/RoomAutoComplete/RoomAutoComplete.tsx

...nts/RoomAutoCompleteMultiple/RoomAutoCompleteMultiple.tsx

...mAutoCompleteMultiple/UserAndRoomAutoCompleteMultiple.tsx

...r/client/components/UserAutoComplete/UserAutoComplete.tsx

...nts/UserAutoCompleteMultiple/UserAutoCompleteMultiple.tsx

...utoCompleteMultiple/UserAutoCompleteMultipleFederated.tsx

...erAutoCompleteMultiple/UserAutoCompleteMultipleOption.tsx

apps/meteor/client/components/UserCard/UserCard.tsx

apps/meteor/client/components/UserInfo/UserInfoAvatar.tsx

apps/meteor/client/components/avatar/AppAvatar.tsx

apps/meteor/client/components/avatar/BaseAvatar.tsx

apps/meteor/client/components/avatar/RoomAvatarEditor.tsx

...t/components/avatar/UserAvatarEditor/UserAvatarEditor.tsx

.../content/attachments/structure/AttachmentAuthorAvatar.tsx

...meteor/client/components/message/variants/RoomMessage.tsx

...teor/client/components/message/variants/SystemMessage.tsx

...teor/client/components/message/variants/ThreadMessage.tsx

...ient/components/message/variants/ThreadMessagePreview.tsx

apps/meteor/client/sidebar/Item/Condensed.stories.tsx