feat: add S3 file upload functionality and update profile image handling

- Added @aws-sdk/client-s3 dependency for S3 interactions.
- Refactored ProfilePage to allow file uploads for avatar and header images, replacing URL inputs with file inputs.
- Implemented loading state and error handling during image uploads.
- Created new API route for handling file uploads to S3, including public URL generation.
- Enhanced RightSidebar to show loading skeleton while fetching data.

package.json

@@ -14,6 +14,7 @@
     "type-check": "tsc --noEmit"
   },
   "dependencies": {
+    "@aws-sdk/client-s3": "^3.972.0",
     "@upstash/redis": "^1.34.3",
     "bcryptjs": "^2.4.3",
     "crypto-js": "^4.2.0",