feat(encryption): Add previous keys fallback variables in encryption config file.

Author: patel-vansh

app/Config/Encryption.php

@@ -23,6 +23,24 @@ class Encryption extends BaseConfig
      */
     public string $key = '';
 
+    /**
+     * --------------------------------------------------------------------------
+     * Previous Encryption Keys fallback enabled
+     * --------------------------------------------------------------------------
+     * If you want to enable decryption using previous keys, set this to true.
+     * See the user guide for more info.
+     */
+    public bool $previousKeysFallbackEnabled = false;
+
+    /**
+     * --------------------------------------------------------------------------
+     * Previous Encryption Keys
+     * --------------------------------------------------------------------------
+     * If you want to enable decryption using previous keys, set them here.
+     * See the user guide for more info.
+     */
+    public array $previousKeys = [];
+
     /**
      * --------------------------------------------------------------------------
      * Encryption Driver to Use