first commit -> move some files from one-api

vendor/aws_v3/GuzzleHttp/Promise/PromisorInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GuzzleHttp\Promise;
+
+/**
+ * Interface used with classes that return a promise.
+ */
+interface PromisorInterface
+{
+    /**
+     * Returns a promise.
+     */
+    public function promise(): PromiseInterface;
+}