WP_HTTP: Map internal Requests hooks to WordPress actions.

This change introduces a `requests-{$hook}` action which can be used to hook into Requests hooks, and restores the `http_api_curl` action.

Props rmccue.
Fixes #37843.


git-svn-id: https://develop.svn.wordpress.org/trunk@39212 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-http.php

@@ -300,7 +300,7 @@ class WP_Http {
 			'timeout' => $r['timeout'],
 			'useragent' => $r['user-agent'],
 			'blocking' => $r['blocking'],
-			'hooks' => new Requests_Hooks(),
+			'hooks' => new WP_HTTP_Requests_Hooks( $url, $r ),
 		);
 
 		// Ensure redirects follow browser behaviour.