support default value

Author: QuentinGab

src/Settings.php

@@ -87,8 +87,9 @@ public function load(): static
     public function get(
         string $namespace,
         string $name,
+        mixed $default = null
     ): ?Setting {
-        return $this->only($namespace)->firstWhere('name', $name);
+        return $this->only($namespace)->firstWhere('name', $name) ?? $default;
     }
 
     /**