REST API: Pass `WP_REST_Request` object to the rest_index filter.

Props johnregan3, TimothyBlynJacobs, Spacedmonkey, hasanuzzamanshamim.
Fixes #48638. 

Built from https://develop.svn.wordpress.org/trunk@52796


git-svn-id: http://core.svn.wordpress.org/trunk@52385 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/class-wp-rest-server.php

@@ -1239,10 +1239,12 @@ class WP_REST_Server {
 		 * available on the API, and a small amount of data about the site.
 		 *
 		 * @since 4.4.0
+		 * @since 6.0.0 Added `$request` parameter.
 		 *
 		 * @param WP_REST_Response $response Response data.
+		 * @param WP_REST_Request  $request  Request data.
 		 */
-		return apply_filters( 'rest_index', $response );
+		return apply_filters( 'rest_index', $response, $request );
 	}
 
 	/**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52795';
+$wp_version = '6.0-alpha-52796';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.