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/modules/background-task/background-task.module.ts

@@ -0,0 +1,24 @@
+import { BullModule } from '@nestjs/bull';
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { AssetEntity } from '../../api-v1/asset/entities/asset.entity';
+import { ExifEntity } from '../../api-v1/asset/entities/exif.entity';
+import { BackgroundTaskProcessor } from './background-task.processor';
+import { BackgroundTaskService } from './background-task.service';
+
+@Module({
+  imports: [
+    BullModule.registerQueue({
+      name: 'background-task',
+      defaultJobOptions: {
+        attempts: 3,
+        removeOnComplete: true,
+        removeOnFail: false,
+      },
+    }),
+    TypeOrmModule.forFeature([AssetEntity, ExifEntity]),
+  ],
+  providers: [BackgroundTaskService, BackgroundTaskProcessor],
+  exports: [BackgroundTaskService],
+})
+export class BackgroundTaskModule {}