[7.x] Add toPsrRequest method in Http Client Request (#33016)

* Add toPsrRequest method
Allows re-build TransferStats attribute when we use http fake

* Update Request.php

Co-authored-by: Taylor Otwell <[email protected]>

Author: domthomas-dev

src/Illuminate/Http/Client/Request.php

@@ -244,6 +244,16 @@ public function withData(array $data)
         return $this;
     }
 
+    /**
+     * Get the underlying PSR compliant request instance.
+     *
+     * @return \Psr\Http\Message\RequestInterface
+     */
+    public function toPsrRequest()
+    {
+        return $this->request;
+    }
+
     /**
      * Determine if the given offset exists.
      *