feat: Implement media picker and camera functionality

- Added permissions for CAMERA, READ_EXTERNAL_STORAGE, READ_MEDIA_IMAGES, and READ_MEDIA_VIDEO in AndroidManifest.xml.
- Introduced MediaPickerBottomSheet for selecting images and videos from the gallery.
- Implemented camera functionality to capture images and send them in chat.
- Created MediaUtils for handling image and file conversions to Base64.
- Updated ChatDetailScreen to handle media selection and sending images/files.
- Enhanced ChatViewModel with methods to send image and file messages.
- Added file_paths.xml for FileProvider configuration.

app/src/main/AndroidManifest.xml

@@ -6,6 +6,10 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32" />
+    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
 
     <application
         android:name=".RosettaApplication"
@@ -34,6 +38,17 @@
             </intent-filter>
         </activity>
         
+        <!-- FileProvider for camera images -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.provider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+        
         <!-- Firebase Cloud Messaging Service -->
         <service
             android:name=".push.RosettaFirebaseMessagingService"