Editor: allow disabling layout controls.

Adds the ability to disable layout controls on a per-block level from theme.json.

Props mukesh27.
Fixes #59294.


git-svn-id: https://develop.svn.wordpress.org/trunk@56534 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-theme-json.php

@@ -340,6 +340,7 @@ class WP_Theme_JSON {
 	 * @since 6.2.0 Added `dimensions.minHeight`, 'shadow.presets', 'shadow.defaultPresets',
 	 *              `position.fixed` and `position.sticky`.
 	 * @since 6.3.0 Added support for `typography.textColumns`, removed `layout.definitions`.
+	 * @since 6.4.0 Added `layout.allowEditing`.
 	 *
 	 * @var array
 	 */
@@ -374,8 +375,9 @@ class WP_Theme_JSON {
 			'minHeight' => null,
 		),
 		'layout'                        => array(
-			'contentSize' => null,
-			'wideSize'    => null,
+			'contentSize'  => null,
+			'wideSize'     => null,
+			'allowEditing' => null,
 		),
 		'position'                      => array(
 			'fixed'  => null,