fix: add hasDebugModeEnabled to Application Contract (#46066)

Author: taka-oyama

src/Illuminate/Contracts/Foundation/Application.php

@@ -99,6 +99,13 @@ public function runningInConsole();
      */
     public function runningUnitTests();
 
+    /**
+     * Determine if the application is running with debug mode enabled.
+     *
+     * @return bool
+     */
+    public function hasDebugModeEnabled();
+
     /**
      * Get an instance of the maintenance mode manager implementation.
      *