first commit -> move some files from one-api

vendor/aws_v3/Aws/Endpoint/UseDualstackEndpoint/ConfigurationInterface.php

@@ -0,0 +1,19 @@
+<?php
+namespace Aws\Endpoint\UseDualstackEndpoint;
+
+interface ConfigurationInterface
+{
+    /**
+     * Returns whether or not to use a DUALSTACK endpoint
+     *
+     * @return bool
+     */
+    public function isUseDualstackEndpoint();
+
+    /**
+     * Returns the configuration as an associative array
+     *
+     * @return array
+     */
+    public function toArray();
+}