[FEAT][MVP]: Add Avatar Demo page and componenbt

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

...ponents/demo-components/avatar-demo/CodeAvatarVariant.tsx

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

...ts/demo-components/avatar-demo/CodeDemoAvatarFallBack.tsx

...ents/demo-components/avatar-demo/CodeDemoAvatarLabels.tsx

...nts/demo-components/avatar-demo/CodeDemoAvatarLoading.tsx

...ts/demo-components/avatar-demo/CodeDemoAvatarPickFile.tsx

...ts/demo-components/avatar-demo/CodeDemoAvatarSmartFit.tsx

...nts/demo-components/avatar-demo/CodeDemoAvatarStyling.tsx

...onents/demo-components/avatar-demo/DemoAvatarFallBack.tsx

...mponents/demo-components/avatar-demo/DemoAvatarLabels.tsx

...ponents/demo-components/avatar-demo/DemoAvatarLoading.tsx

...onents/demo-components/avatar-demo/DemoAvatarPickFile.tsx

...ponents/demo-components/avatar-demo/DemoAvatarStyling.tsx

...ponents/demo-components/avatar-demo/DemoAvatarVarians.tsx

src/pages/demo/AvatarDemoPage.tsx