118 - Implement shared album feature (#124)

* New features 
  - Share album. Users can now create albums to share with existing people on the network.
  - Owner can delete the album.
  - Owner can invite the additional users to the album.
  - Shared users and the owner can add additional assets to the album.
* In the asset viewer, the user can swipe up to see detailed information and swip down to dismiss.
* Several UI enhancements.

server/src/api-v1/sharing/entities/asset-shared-album.entity.ts

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+import { Column, Entity, JoinColumn, ManyToOne, OneToOne, PrimaryGeneratedColumn, Unique } from 'typeorm';
+import { AssetEntity } from '../../asset/entities/asset.entity';
+import { SharedAlbumEntity } from './shared-album.entity';
+
+@Entity('asset_shared_album')
+@Unique('PK_unique_asset_in_album', ['albumId', 'assetId'])
+export class AssetSharedAlbumEntity {
+  @PrimaryGeneratedColumn()
+  id: string;
+
+  @Column()
+  albumId: string;
+
+  @Column()
+  assetId: string;
+
+  @ManyToOne(() => SharedAlbumEntity, (sharedAlbum) => sharedAlbum.sharedAssets, {
+    onDelete: 'CASCADE',
+    nullable: true,
+  })
+  @JoinColumn({ name: 'albumId' })
+  albumInfo: SharedAlbumEntity;
+
+  @ManyToOne(() => AssetEntity, {
+    onDelete: 'CASCADE',
+    nullable: true,
+  })
+  @JoinColumn({ name: 'assetId' })
+  assetInfo: AssetEntity;
+}

server/src/api-v1/sharing/entities/shared-album.entity.ts

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+import { Column, CreateDateColumn, Entity, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
+import { AssetSharedAlbumEntity } from './asset-shared-album.entity';
+import { UserSharedAlbumEntity } from './user-shared-album.entity';
+
+@Entity('shared_albums')
+export class SharedAlbumEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  ownerId: string;
+
+  @Column({ default: 'Untitled Album' })
+  albumName: string;
+
+  @CreateDateColumn({ type: 'timestamptz' })
+  createdAt: string;
+
+  @Column({ comment: 'Asset ID to be used as thumbnail', nullable: true })
+  albumThumbnailAssetId: string;
+
+  @OneToMany(() => UserSharedAlbumEntity, (userSharedAlbums) => userSharedAlbums.albumInfo)
+  sharedUsers: UserSharedAlbumEntity[];
+
+  @OneToMany(() => AssetSharedAlbumEntity, (assetSharedAlbumEntity) => assetSharedAlbumEntity.albumInfo)
+  sharedAssets: AssetSharedAlbumEntity[];
+}

server/src/api-v1/sharing/entities/user-shared-album.entity.ts

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+import { Column, Entity, JoinColumn, ManyToOne, OneToOne, PrimaryGeneratedColumn, Unique } from 'typeorm';
+import { UserEntity } from '../../user/entities/user.entity';
+import { SharedAlbumEntity } from './shared-album.entity';
+
+@Entity('user_shared_album')
+@Unique('PK_unique_user_in_album', ['albumId', 'sharedUserId'])
+export class UserSharedAlbumEntity {
+  @PrimaryGeneratedColumn()
+  id: string;
+
+  @Column()
+  albumId: string;
+
+  @Column()
+  sharedUserId: string;
+
+  @ManyToOne(() => SharedAlbumEntity, (sharedAlbum) => sharedAlbum.sharedUsers, {
+    onDelete: 'CASCADE',
+    nullable: true,
+  })
+  @JoinColumn({ name: 'albumId' })
+  albumInfo: SharedAlbumEntity;
+
+  @ManyToOne(() => UserEntity)
+  @JoinColumn({ name: 'sharedUserId' })
+  userInfo: UserEntity;
+}