865: add getParams/setParam to RequestInterface

As per issue #865, the getParams and setParams method is missing from the RequestInterface. Which are methods relied upon heavily in app/code/Magento/*

Author: Ash Smith

lib/internal/Magento/Framework/App/RequestInterface.php

@@ -48,6 +48,22 @@ public function setActionName($name);
      */
     public function getParam($key, $defaultValue = null);
 
+    /**
+     * Set params from key value array
+     *
+     * @param array $params
+     * @return $this
+     */
+    public function setParams(array $params);
+
+    /**
+     * Retrieve all params as array
+     *
+     * @return array
+     */
+    public function getParams();
+
+
     /**
      * Retrieve cookie value
      *