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.

mobile/lib/modules/sharing/ui/asset_grid_by_month.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/modules/sharing/ui/selection_thumbnail_image.dart';
+import 'package:immich_mobile/shared/models/immich_asset.model.dart';
+
+class AssetGridByMonth extends HookConsumerWidget {
+  final List<ImmichAsset> assetGroup;
+  const AssetGridByMonth({Key? key, required this.assetGroup}) : super(key: key);
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    return SliverGrid(
+      gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+        crossAxisCount: 4,
+        crossAxisSpacing: 5.0,
+        mainAxisSpacing: 5,
+      ),
+      delegate: SliverChildBuilderDelegate(
+        (BuildContext context, int index) {
+          return SelectionThumbnailImage(asset: assetGroup[index]);
+        },
+        childCount: assetGroup.length,
+      ),
+    );
+  }
+}