feat: add support for multiple event dates in variants

- Updated the FeaturedGroupService to include 'variants.eventDates' in the items query.
- Introduced a BelongsToMany relationship in EventDate for selected variants.
- Modified PurchaseItemResource and PurchaseItemSnapshotFactory to handle multiple event dates for variants.
- Enhanced StartCheckoutService to load event dates for variants.
- Updated TicketGeneratorService to accommodate event dates in ticket generation.
- Created migrations to support multi-value event dates and allow multiple variant values per attribute.
- Adjusted seeders to reflect new event date handling and added new attributes.
- Added tests to ensure correct functionality for multi-date variants and their integration with ticket generation.

app/Domains/Catalog/Models/ItemAttribute.php

@@ -11,6 +11,7 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
 #[Fillable([
     'catalog_item_id',
     'attribute_id',
+    'allow_multi_select',
 ])]
 class ItemAttribute extends Model
 {
@@ -18,6 +19,15 @@ class ItemAttribute extends Model
 
     protected $table = 'item_attributes';
 
+    protected function casts(): array
+    {
+        return [
+            'catalog_item_id' => 'integer',
+            'attribute_id' => 'integer',
+            'allow_multi_select' => 'boolean',
+        ];
+    }
+
     /** @return BelongsTo<CatalogItem, $this> */
     public function catalogItem(): BelongsTo
     {