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/entities/exif.entity.ts

@@ -0,0 +1,67 @@
+import { Index, JoinColumn, OneToOne } from 'typeorm';
+import { Column } from 'typeorm/decorator/columns/Column';
+import { PrimaryGeneratedColumn } from 'typeorm/decorator/columns/PrimaryGeneratedColumn';
+import { Entity } from 'typeorm/decorator/entity/Entity';
+import { AssetEntity } from './asset.entity';
+
+@Entity('exif')
+export class ExifEntity {
+  @PrimaryGeneratedColumn()
+  id: string;
+
+  @Index({ unique: true })
+  @Column({ type: 'uuid' })
+  assetId: string;
+
+  @Column({ nullable: true })
+  make: string;
+
+  @Column({ nullable: true })
+  model: string;
+
+  @Column({ nullable: true })
+  imageName: string;
+
+  @Column({ nullable: true })
+  exifImageWidth: number;
+
+  @Column({ nullable: true })
+  exifImageHeight: number;
+
+  @Column({ nullable: true })
+  fileSizeInByte: number;
+
+  @Column({ nullable: true })
+  orientation: string;
+
+  @Column({ type: 'timestamptz', nullable: true })
+  dateTimeOriginal: Date;
+
+  @Column({ type: 'timestamptz', nullable: true })
+  modifyDate: Date;
+
+  @Column({ nullable: true })
+  lensModel: string;
+
+  @Column({ type: 'float8', nullable: true })
+  fNumber: number;
+
+  @Column({ type: 'float8', nullable: true })
+  focalLength: number;
+
+  @Column({ nullable: true })
+  iso: number;
+
+  @Column({ type: 'float', nullable: true })
+  exposureTime: number;
+
+  @Column({ type: 'float', nullable: true })
+  latitude: number;
+
+  @Column({ type: 'float', nullable: true })
+  longitude: number;
+
+  @OneToOne(() => AssetEntity, { onDelete: 'CASCADE', nullable: true })
+  @JoinColumn({ name: 'assetId', referencedColumnName: 'id' })
+  asset: ExifEntity;
+}