Implemented EXIF store and display (#19)

* Added EXIF extracting in the backend
* Added EXIF displaying on `image_viewer_page.dart`
* Added Icon for backup option not enable

server/src/api-v1/asset/asset.service.ts

@@ -112,4 +112,14 @@ export class AssetService {
       },
     });
   }
+
+  public async getAssetById(authUser: AuthUserDto, assetId: string) {
+    return await this.assetRepository.findOne({
+      where: {
+        userId: authUser.id,
+        id: assetId,
+      },
+      relations: ['exifInfo'],
+    });
+  }
 }