Coding Standards: Improve organization of the WPCS-based PHPCS ruleset.

This commit:
* Adds section headers to the ruleset file.
* Organizes all directives in their respective sections.

No functional changes.

Props jrf.
See #59161.
Built from https://develop.svn.wordpress.org/trunk@56593


git-svn-id: http://core.svn.wordpress.org/trunk@56105 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56592';
+$wp_version = '6.4-alpha-56593';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.