lib: Introduce Web::getRequest()

Basic auth will need the request before we set up the front controller.

refs #9660

library/Icinga/Application/Web.php

@@ -136,6 +136,16 @@ class Web extends ApplicationBootstrap
         return $this->frontController;
     }
 
+    /**
+     * Get the request
+     *
+     * @return Request
+     */
+    public function getRequest()
+    {
+        return $this->request;
+    }
+
     /**
      * Getter for view
      *