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-admin/site-editor.php

@@ -49,7 +49,7 @@ foreach ( get_default_block_template_types() as $slug => $template_type ) {
 	$indexed_template_types[] = $template_type;
 }
 
-$block_editor_context = new WP_Block_Editor_Context();
+$block_editor_context = new WP_Block_Editor_Context( array( 'name' => 'core/edit-site' ) );
 $custom_settings      = array(
 	'siteUrl'                              => site_url(),
 	'postsPerPage'                         => get_option( 'posts_per_page' ),