Feature - Implemented virtual scroll on web (#573)

This PR implemented a virtual scroll on the web, as seen in this article.

[Building the Google Photos Web UI](https://medium.com/google-design/google-photos-45b714dfbed1)

web/src/lib/models/asset-grid-state.ts

@@ -0,0 +1,40 @@
+import { AssetResponseDto } from '@api';
+
+export class AssetBucket {
+	/**
+	 * The DOM height of the bucket in pixel
+	 * This value is first estimated by the number of asset and later is corrected as the user scroll
+	 */
+	bucketHeight!: number;
+	bucketDate!: string;
+	assets!: AssetResponseDto[];
+	cancelToken!: AbortController;
+}
+
+export class AssetGridState {
+	/**
+	 * The total height of the timeline in pixel
+	 * This value is first estimated by the number of asset and later is corrected as the user scroll
+	 */
+	timelineHeight: number = 0;
+
+	/**
+	 * The fixed viewport height in pixel
+	 */
+	viewportHeight: number = 0;
+
+	/**
+	 * The fixed viewport width in pixel
+	 */
+	viewportWidth: number = 0;
+
+	/**
+	 * List of bucket information
+	 */
+	buckets: AssetBucket[] = [];
+
+	/**
+	 * Total assets that have been loaded
+	 */
+	assets: AssetResponseDto[] = [];
+}