Add DumpStagesCommand to dump package stages and their locations

src/StaticPHP/Package/Package.php

@@ -128,6 +128,16 @@ abstract class Package
         $this->stages[$name] = $stage;
     }
 
+    /**
+     * Get all defined stages for this package.
+     *
+     * @return array<string, callable>
+     */
+    public function getStages(): array
+    {
+        return $this->stages;
+    }
+
     /**
      * Check if the package has a specific stage defined.
      *