Create snapshot, track, and user models

src/models/playlist-snapshot.ts

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+import type { User } from './user';
+import type { Track } from './track';
+
+export interface PlaylistSnapshot {
+  description: string;
+  num_followers: number;
+  original_name: string;
+  owner: User;
+  snapshot_id: string;
+  tracks: Track[];
+  unique_name: string;
+  url: string;
+}

src/models/track.ts

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+import type { User } from './user';
+
+export interface Track {
+  added_at: string;
+  album: {
+    name: string;
+    url: string;
+  };
+  artists: User[];
+  duration_ms: number;
+  name: string;
+  url: string;
+  date_added: string;
+  date_added_asterisk: boolean;
+  date_removed: string | null;
+  position?: string;
+  retention?: number;
+}

src/models/user.ts

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+export interface User {
+  name: string;
+  url: string;
+}