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/dto/create-exif.dto.ts

@@ -0,0 +1,48 @@
+import { IsNotEmpty, IsOptional } from 'class-validator';
+
+export class CreateExifDto {
+  @IsNotEmpty()
+  assetId: string;
+
+  @IsOptional()
+  make: string;
+
+  @IsOptional()
+  model: string;
+
+  @IsOptional()
+  imageName: string;
+
+  @IsOptional()
+  exifImageWidth: number;
+
+  @IsOptional()
+  exifImageHeight: number;
+
+  @IsOptional()
+  fileSizeInByte: number;
+
+  @IsOptional()
+  orientation: string;
+
+  @IsOptional()
+  dateTimeOriginal: Date;
+
+  @IsOptional()
+  modifiedDate: Date;
+
+  @IsOptional()
+  lensModel: string;
+
+  @IsOptional()
+  fNumber: number;
+
+  @IsOptional()
+  focalLenght: number;
+
+  @IsOptional()
+  iso: number;
+
+  @IsOptional()
+  exposureTime: number;
+}