Add WP_Block_Editor_Context::$name

Adds a new `WP_Block_Editor_Context::$name` and field. This allows plugin
developers to tell which block editor is being loaded when using filters such as
`allowed_block_types_all` and `block_editor_rest_api_preload_paths`.

Fixes #55301.
Props talldanwp, gziolo, andraganescu.


git-svn-id: https://develop.svn.wordpress.org/trunk@52942 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-customize-widgets.php

@@ -838,7 +838,11 @@ final class WP_Customize_Widgets {
 		 */
 
 		if ( wp_use_widgets_block_editor() ) {
-			$block_editor_context = new WP_Block_Editor_Context();
+			$block_editor_context = new WP_Block_Editor_Context(
+				array(
+					'name' => 'core/customize-widgets',
+				)
+			);
 
 			$editor_settings = get_block_editor_settings(
 				get_legacy_widget_block_editor_settings(),