chore: Add a base tenant model for extension

src/Database/Eloquent/Tenant.php

@@ -0,0 +1,21 @@
+<?php
+declare(strict_types=1);
+
+namespace Sprout\Database\Eloquent;
+
+use Illuminate\Database\Eloquent\Model;
+use Sprout\Contracts\Tenant as TenantContract;
+use Sprout\Database\Eloquent\Concerns\IsTenant;
+
+/**
+ * Abstract Tenant Class
+ *
+ * This class exists for simplicity’s sake, allowing users to extend
+ * rather than implement.
+ *
+ * @package Database\Eloquent
+ */
+abstract class Tenant extends Model implements TenantContract
+{
+    use IsTenant;
+}