feat: payment gateway folder identification

.gitignore

@@ -1 +1,2 @@
+node_modules
 vendor

src/Payments/Gateway.php

@@ -38,6 +38,13 @@ public function settings(): Collection;
      */
     public function technicalName(): string;
 
+    /**
+     * Get payment method folder name.
+     *
+     * @return string
+     */
+    public function folderName(): string;
+
     /**
      * Get payment method name.
      *