Themes: Implement file description for `theme.json`.

This changeset adds a file description for `theme.json`. This description is notably used in the Theme File Editor.

Props ocean90, kapilpaul, poena.
Fixes #55325.

Built from https://develop.svn.wordpress.org/trunk@54140


git-svn-id: http://core.svn.wordpress.org/trunk@53699 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/file.php

@@ -21,6 +21,7 @@ $wp_file_descriptions = array(
 	'searchform.php'        => __( 'Search Form' ),
 	'404.php'               => __( '404 Template' ),
 	'link.php'              => __( 'Links Template' ),
+	'theme.json'            => __( 'Theme Styles & Block Settings' ),
 	// Archives.
 	'index.php'             => __( 'Main Index Template' ),
 	'archive.php'           => __( 'Archives' ),

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-alpha-54139';
+$wp_version = '6.1-alpha-54140';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.