HTTP API: Replace internals with Requests library.

Requests is a library very similar to WP_HTTP, with a high level of unit test coverage, and has a common lineage and development team. It also supports parallel requests.

See #33055.


git-svn-id: https://develop.svn.wordpress.org/trunk@37428 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/Requests/Exception/Transport.php

@@ -0,0 +1,5 @@
+<?php
+
+class Requests_Exception_Transport extends Requests_Exception {
+
+}