Fix types in Controller and View classes (#18397)

* Set yii\base\Controller::actions() return type
* Change yii\base\View::$params type to array

framework/base/Controller.php

@@ -129,6 +129,7 @@ class Controller extends Component implements ViewContextInterface
      *
      * [[\Yii::createObject()]] will be used later to create the requested action
      * using the configuration provided here.
+     * @return array
      */
     public function actions()
     {

framework/base/View.php

@@ -50,7 +50,7 @@ class View extends Component implements DynamicContentAwareInterface
      */
     public $context;
     /**
-     * @var mixed custom parameters that are shared among view templates.
+     * @var array custom parameters that are shared among view templates.
      */
     public $params = [];
     /**