[WEB] Upload asset directly to album (#379)

* Added stores to get album assetId

* Upload assets and add to album

* Added comments

* resolve conflict when add assets from upload directly

* Filtered out duplicate asset before adding to the album

web/src/lib/stores/album-upload-asset.ts

@@ -0,0 +1,13 @@
+import { writable } from 'svelte/store';
+
+function createAlbumUploadStore() {
+	const albumUploadAsset = writable<Array<string>>([]);
+	const albumUploadAssetCount = writable<number>(9999);
+
+	return {
+		asset: albumUploadAsset,
+		count: albumUploadAssetCount
+	};
+}
+
+export const albumUploadAssetStore = createAlbumUploadStore();