[WIP][FEAT]: Add Basic avater demo (read only)

...MainPage/SecondaryRight/ExtraComponentsMainPageAvatar.tsx

...omponents/demo-components/avatar-demo/BasicDemoAvatar.tsx

...nents/demo-components/avatar-demo/CodeDemoAvatarBasic.tsx

src/data/imagesURL.js

src/files-ui/components/avatar/Avatar.tsx

src/files-ui/components/avatar/AvatarProps.ts

.../components/FIleMosaicImageLayer/FileMosaicImageLayer.tsx

...nts/file-mosaic/components/file-mosaic/FileMosaicProps.ts

...-ui/components/previews/ImagePreview/ImagePreviewProps.ts

src/pages/demo/AvatarDemoPage.tsx

src/pages/demo/FileCardDemoPage.jsx

src/pages/demo/FileMosaicDemoPage.jsx